How Special Relativity Makes Magnets Work

  • Опубликовано:  4 года назад
  • MinutePhysics on permanent magnets: ruclip.com/video/hFAOXdXZ5TM/
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    Magnetism seems like a pretty magical phenomenon. Rocks that attract or repel each other at a distance - that's really cool - and electric current in a wire interacts in the same way. What's even more amazing is how it works. We normally think of special relativity as having little bearing on our lives because everything happens at such low speeds that relativistic effects are negligible. But when you consider the large number of charges in a wire and the strength of the electric interaction, you can see that electromagnets function thanks to the special relativistic effect of length contraction. In a frame of reference moving with the charges, there is an electric field that creates a force on the charges. But in the lab frame, there is no electric field so it must be a magnetic field creating the force. Hence we see that a magnetic field is what an electric field becomes when an electrically charged object starts moving.

    I was inspired to make this video by Prof. Eric Mazur mazur.harvard.edu/emdetails.php

    Huge thank you to Ralph at the School of Physics, University of Sydney for helping us out with all this magnetic gear. Thanks also to geology for loaning the rocks.

    This video was filmed in the studio at the University of New South Wales - thanks to all the staff there for their time and support.

    Music: Firefly in a Fairytale, Nathaniel Schroeder, and Love Lost (Instrumental) by Temper Trap licensed from CueSongs.com
  • ОбразованиеОбразование
  • Длительность: 4:19
  • veritasium  science  physics  magnet  magnets  magnetic  how do electromagnets work?  how do magnets work?  special relativity  length contraction  attract  repel  minutephysics  charged cat  

Комментарии: 4 434

  • steve istheman
    steve istheman 2 часа назад

    it's funny how everyone rips on icp for asking how magnets work. it's actually a good question.

  • Nicolas Duguay
    Nicolas Duguay 2 дня назад

    Am I the only one who's seeing a cat with his anus in place of his face?

  • Bio Hacker TV
    Bio Hacker TV 2 дня назад

    Love your show bro

  • Rick Flare
    Rick Flare 2 дня назад

    Faraday wondered why, when the distance between two objects is doubled their mutual attraction (voidance) for one another falls
    off to one-fourth the former. Faraday was highly dubious regarding Newtons conclusions about force. The fact is that the “missing three-fourths of the force” is not lost whatsoever, the loss of mutual acceleration is in counterspace and mediated between both dielectricity and magnetism, both impelled by and ‘lost’ therein; this is a natural attribute to dielectricity, either as found in the so-
    called “magnet” or in its aggregated form as found in mass/matter. Newton’s equation is not about force, or as argued by others, tension, rather dielectric voidance. In which case we have the equation of Newton corrected: D.V. = M1 x M2/ Distance^2. All acceleration of bodies via gravity or “magnets” are undergoing dielectric voidance, or magnetic (so-called) induction and resultant acceleration is the simplex process of dielectric voidance. The presumed increasing or decreasing ‘force’ is merely a field attribute necessitated by which spatial voidance is enacted to mediate the dielectric field voidances which eliminate space in their accelerations towards pressure voidances created by magnetism. Absolute acceleration is zero empirical movement, or perfect Ether inertia. F=ma is correctly pertaining to “magnetism” and gravity: Voidance = dielectricity as measured in mass x acceleration. As stated, magnetism cannot, has never attracted or accelerated anything, rather only causes dielectric coherency and resultant acceleration by means of dielectricity in voidance. Both gravity and so-called “magnetic attraction” operate off the principle of shrinking spheres of dielectric voidance in which, as found in the case of both, the decreasing spherical area is proportional to the voidance and resulting acceleration. Faradays “missing three-fourths of the force” is not missing, it is and always has been a
    translational exchange between increasing or decreasing space in which both magnetism and dielectricity mediate field pressures.

  • DanyDM
    DanyDM 2 дня назад

    My life is a lie

  • Hexor1211
    Hexor1211 3 дня назад

    Great application of relativistic thinking, but it would be very nice to mention a few things. isn't that Theory of relativity combines some older electromagnetic theories with other theories.
    Aren't just Maxwell's Equation enough to explain the phenomenon?
    Maxwell was before the Einstein. Isn't Einstein knew the Maxwell's equation and used this findings in his research?
    Also, Einstein had to know about Lorentz's factor.
    May be we tend to credit the Einstein and relativity for findings of others?

  • xkguy
    xkguy 3 дня назад

    Proving again that the internet was built for cat videos (and i guess pron)

  • Electro-Cute
    Electro-Cute 3 дня назад

    That is not how magnetism works. If that was the case then the cat would be attracted when not moving because the electrons should contract from the perspective of the cat. Another problem would be if the current was made out of cats moving to the left and the electrons where stationary. Then the cat should experience a repulsive force when it is stationary, even if the current isn't the same.
    None of these examples happen in real life, it is only when the cat ion starts to move trough a magnetic field that it starts to experience a force, but that is based on how it moves relative to the field and not relative to the movement of charged particles. This is why magnetic fields tend to induce torque or angular velocity and not simple forces.

  • Sumner Stuart
    Sumner Stuart 3 дня назад

    Hahaha hahaha hahaha special relativity is an explanation. And a poor one.

  • Bill Aynes
    Bill Aynes 3 дня назад

    Why you people continue throwing BS?

  • Obnyr
    Obnyr 3 дня назад

    From your frame of reference, the electrons are moving, so they should be slightly closer together, creating a net negative charge that would attract the cat. So the cat is attracted in your frame of reference but repelled in its own. Paradox.

  • CLeeP1983
    CLeeP1983 4 дня назад

    More likely, all the electrons being pumped into the wire are pushing out protons.

  • CLeeP1983
    CLeeP1983 4 дня назад

    Ok, so protons can bunch up when the cat moves but electrons cant bunch up under current flow?

  • IronMongoose1
    IronMongoose1 4 дня назад

    Thanks for making this video. I didn't want to ask a scientist.

  • NAANsoft
    NAANsoft 4 дня назад

    Awesome! A great, fun explanation that is easy to understand. I am catalyzed... :-)

  • Serock
    Serock 4 дня назад

    This is so cool, how can i never have heard about this before?

  • A Newt
    A Newt 4 дня назад

    electric motors make much more sense to me now

  • Arturas Karbocius
    Arturas Karbocius 4 дня назад

    Ant super strong magnetic force is Midi-chlorian? or 0,000000001% of earth gravity ?

  • Arturas Karbocius
    Arturas Karbocius 4 дня назад

    Ant super strong magnetic force is Midi-chlorian? or 0,000000001% of earth gravity ?

  • GraemeMarkNI
    GraemeMarkNI 4 дня назад

    Trippy

  • Don
    Don 5 дней назад

    Ignorant nonsense. Take more physics courses before you pretend.

  • Alex Layton
    Alex Layton 5 дней назад

    Somebody call ICP

  • Shaun Janoschka
    Shaun Janoschka 5 дней назад

    complete utter nonsense.... and I'm being polite.

  • 55rebels
    55rebels 5 дней назад

    Guess they haven't figured out yet, that relativity is DEAD. Quantum physics and relativity do not play nice together. This should, give them some kind of clue, that they are indeed... clueless.
    ....What a joke.

  • Albert Person
    Albert Person 5 дней назад

    This is the biggest crock of pooh that I have ever heard.... Better start looking for a new gig Veritasium dude...

  • Daemon Nice
    Daemon Nice 5 дней назад

    Nonsense. His explanation is absurd. How can you describe how magnetism works if you do not even know what a charge is? What is a positive or a negative charge and more importantly; what makes them different? And as far as an electric field is just a magnetic field viewed at different angles is even more nonsense. Within electromagnetism you have two fields at right angles to each other and at right angles to the flow; one is the electric field and the other is the magnetic field. Electric fields can have monopole moments but not magnetic fields, they are always dipolar. This is just another church of Einstein propaganda moment and as brilliant as he was, he was not always correct and even he seriously doubted the longevity of his work.

    What is a charge? It seems rather obvious and Maxwell even referred to it as well it is a quality that is similar to what is used to describe the motion of electrons and protons and even quarks and is seen in both the micro and the macro world(spiral galaxies)., and that is spin, though, just because they use the word spin does not mean that they mean spin. OOOO those quantum physicists and their confuscating language.

    Spin is an oversimplification for it is more like a vortex and vortexes are an established quality of fluid dynamics and therefore magnetohydrodynamics. I will offer two hypothesis that does not involve Einsteinian equations.

    #1~Draw a clockwise spiral on a piece of paper and right beside it draw a counterclockwise spiral of exactly the same dimensions. This is a visual representation of the charge as spin(spiral/vortex). Note clockwise and counterclockwise appear to move in opposite direction and therefore have opposite charge. Fold the paper midway between the two image and see how they now appear to move in the same direction causing attraction. Draw two clockwise circles side by side and fold the paper and they do not align up therefore repelling.

    #2~This is my personal favorite and is based on the observations of Viktor Schauberger, aka, the water wizard. His motto was, comprehend and copy nature. Again it is all about vortici, but rather than just being clockwise or counterclockwise, they are convergent and divergent, aka, centrifugal and centripetal. Positive charge = Q+ is centrifugal and divergent (moving from the center to the outer) and negative charge = Q- is centripetal and convergent(moving from outer edges towards the center). The north pole is Q+ moving outward and the south pole is Q- moving inward thus attracting.

  • Ratt Butt
    Ratt Butt 5 дней назад

    Wait, so why does the cat feel a force even when it's not moving? I mean, why does a stationary object next to an electrified wire loop feel a force?

  • B and B
    B and B 5 дней назад

    if a force is noly noticeable from one view that means that its just a theoreatical force

  • Rubayat Hassan
    Rubayat Hassan 5 дней назад

    how come no one told me this when they were teaching me about magnets!

  • J Snow
    J Snow 5 дней назад

    Yeah Science!!

  • Pan Daimonium
    Pan Daimonium 5 дней назад

    This explanation doesn't make sense. If a cation moving at the same speed as the electrons experiences a repulsion, then a stationary cation should experience an attraction -- it's exactly the same scenario (in the cat's frame of reference) but with the charges in the wire reversed. Also, the theory of electromagnetism predicts that the cat will actually travel in a loop, if at all -- first repelled from the wire and then attracted back toward it.

  • Tim Crinion
    Tim Crinion 6 дней назад

    Wow, I learnt something today!

  • itsme minime
    itsme minime 6 дней назад

    i dont understand this but i think i got it !

  • binaryguru
    binaryguru 6 дней назад

    Electrons don't really 'move' through wire. This explanation makes no sense at all.

  • Zigurath100
    Zigurath100 6 дней назад

    the holes move too

  • Jim Pifarre
    Jim Pifarre 6 дней назад

    Do Humans have magnetic fields..?

  • pobembe1958
    pobembe1958 6 дней назад

    If magnetism is the same as an electric field, then why does it not work on non-metals since an ordinary electric field will polarize and attract non-metals. Aren't you just grasping for an explanation that doesn't really work?

  • AThagoras
    AThagoras 6 дней назад

    Wow! I didn't know the connection between electric and magnetic forces had anything to do with relativity.
    But a stationary charged cat experiences a force, whereas a charged cat moving at half the velocity of the electrons would feel no force?

  • lerch25
    lerch25 6 дней назад

    If magnetism doesn't actually exist then all of the physicists searching for a magnetic monopole definitely wasting their time.

  • TRASHURE
    TRASHURE 6 дней назад

    This does not explain what a field is, no one, and nothing has, they have merely explained many attributes. If you are far away from a train sailing across a plain, it will appear to move slowly, sure. If you are still in your far away vantage point, and use a powerful telescope to expand the resolution, you will see everything moving along just as quickly. Distance has nothing to do with time itself, even if those light waves are reaching you later than the actual event. Be objective, don't gobble down exotic theorums without thinking. You can prove anything with an equation, whether it's correct, incorrect, or correct while being applied incorrectly.

  • Warren NZ
    Warren NZ 6 дней назад

    Interesting. I've never heard electromagnetism explained like this and I did a degree in physics. Thanks Veritasium!

  • Vadim Ivlev
    Vadim Ivlev 6 дней назад

    With all my respect to the channel, it seems that is not a correct explanation of magnetic forces. From a frame of reference not moving relative to the wire the same line of reasoning will lead you to the conclusion that the cat will feel the force and move in the opposite direction (to the wire), which is a contradiction of course. The reality should be basically the same for any observer after all.

  • mrchapsnap
    mrchapsnap 6 дней назад

    pshhhhh.. everyone knows it's miracles make them work duh

  • Robert South
    Robert South 6 дней назад

    So alternating current can't be used to make an electromagnet?

  • MangopeoplefromBR
    MangopeoplefromBR 6 дней назад

    Great. Any counter opinion?

  • VicMikesvideodiary
    VicMikesvideodiary 6 дней назад

    In the beginning of your example you show electrons moving while the cat is stationary. So shouldn't the cat become attracted to the wire in this situation instead of being neutral?

  • Puru Yadav
    Puru Yadav 6 дней назад

    you are looking slim!
    only in your frame of reference

  • Timothy Golden
    Timothy Golden 6 дней назад

    I'm fairly certain that this is junk physics. I'll try to keep an open mind, but magnetism has never taken this interpretation before. If true, then you'll need to expound far more as well as cite some sources. You are testing us.

    • Timothy Golden
      Timothy Golden 6 дней назад

      The simplest falsification of this presentation that I've thought of so far is to place a magnet which has no charge, such as a compass needle, near the current carrying wire and observe the effect. This is a totrally different discussion than a charged body. Magnetism has more geometry than an electric field. This is confounded by even considering the relativistic effects of motion of a charged body, which by ordinary electromagnetic theory will be providing a magnetic field as it passes a stationary observer. It's difficult to pose a strong falsification to such a vague theory as the charged cat argument. There is a complete lack of correspondence (and detail) within the argument as represented in this four minute video.

  • Philosopher8659
    Philosopher8659 6 дней назад +2

    That is one of the most illiterate, delusion, moronic titles I have seen.

    A description makes the thing work.

  • Matheus Cruz
    Matheus Cruz 6 дней назад

    E v e r y t h i n g i s e l e c t r i c

  • Dom Ex
    Dom Ex 6 дней назад

    Firstly its the electromagnetic force not an electric field or a magnetics field , in the same way space and time are spacetime not separate see the standard model of quantum physics

  • Ashish Bamola
    Ashish Bamola 6 дней назад

    ruclip.com/video/4RUZ00P8mbY/

  • Kirk Claybrook
    Kirk Claybrook 7 дней назад

    Hmmm cats and electricity has been on my to-do list for a long time...

  • Alastair Carnegie
    Alastair Carnegie 7 дней назад

    Check out the views on "Special Relativity" by Nikola Tesla..... If it was anybody else, we should not pay a lot of attention, but to paraphrase Nikola Tesla "Special Relativity is utter balderdash!"... and I often wonder why he came to that conclusion?

  • Prasad NSG
    Prasad NSG 7 дней назад

    How do you account for random direction of each electron?

  • John Newman
    John Newman 7 дней назад

    explain it again! confusing

  • Simon Ruszczak
    Simon Ruszczak 7 дней назад

    So why do two bar magnets attract or repeal each other ?

    Virtual electro-static forces.

  • pineapplepenumbra
    pineapplepenumbra 7 дней назад

    So photons are actually really long, they just look short because they're moving so fast?

  • betaneptune
    betaneptune 7 дней назад

    I think the bit with the clock on the moving sidewalk is wrong. If you put a clock in the hands of the dark-shirt guy, that guy will see 6 hours go by. But this clock is moving relative to plaid-shirt guy. So plaid shirt will see dark shirt's clock going slower than his own, meaning that from plaid shirt's point of view, the shaving was more than 6 hours ago, not less.

    Keep in mind that each person will see the other person's clock going slower. So plaid shirt guy will measure the interval to be _more_ than 6 hours. OTOH, dark shirt guy will see plaid shirt guy's clock going slower, so that dark shirt will see 6 hours pass on _his_ clock but will see 5 hours 59 min. 59.99999...9 go by on plaid shirt's clock.

    Yes, this could lead to the Twin Paradox, except plaid shirt never returns to dark shirt, so there is no paradox.

  • Nik Gjonbalaj
    Nik Gjonbalaj 7 дней назад +1

    "You're looking slim."
    "Only in your frame of reference."

    I died.

  • turtlellamacow
    turtlellamacow 9 дней назад +1

    this has nothing to do with the main point of the video but......the stationary Derek, who shaved six hours ago in his reference frame, measures the proper time, and the relatively moving Derek should measure a LONGER (dilated) time, not a shorter one! (right?)

    • betaneptune
      betaneptune 7 дней назад +1

      Yes. I added a similar comment making the same point about an hour ago.

  • J3AN P3T3R
    J3AN P3T3R 10 дней назад

    i'm still stupid. can i please ask for a clarification on "Objects takes up more space when they are not moving" ? when you say objects does it mean any every day object like a ball ? because to a simpleton like myself i would think a ball that can be fitted perfectly into a 1 square foot box would still be the same size when its moving and thus would take up the same amount of space even if its moving unless its shape is changed somehow while in motion ? or maybe its the "space" thing that i don't understand especially those Einstein space thing.

    • J3AN P3T3R
      J3AN P3T3R 7 дней назад

      but if it's just based on "View" from one point or another then the length of an object is physically still the same and would only look longer from a different reference frame ? not all objects moving does not change shape ?

    • betaneptune
      betaneptune 7 дней назад

      J3AN P3T3R - You need to keep in mind that events that are simultaneous in one reference frame are not in another. How do you measure length? You note the position of the leading edge and the trailing edge of the object _at the same time_. Now, "the same time" is different in different frames, which is why you get the contraction in the first place. The object doesn't get compressed; it just looks appears to from different frames.

      There is a video about this very question:

      https://youtu.be/Xrqj88zQZJg

      The video imagines a train whose length is the same as an outdoor tunnel (when there is no relative velocity between the two). Now assume the train starts moving. From the ground the train has shortened. From the train, the tunnel has shortened. Suppose we close the doors, and then open them quickly (like a camera or projector shutter) at the same time as viewed from the earth while the train is in the tunnel. The train will fit and if the doors are opened quickly enough, they will not hit the train. Won't this cause a contradiction, as from the train it is the tunnel that is shorter? No! Because in the train frame, the doors close and open at different times in such away as to avoid hitting the train. See the video.

  • Pașca Alexandru
    Pașca Alexandru 10 дней назад

    But... electrons don't flow (or drift in one direction). They bounce each other from orbits in a cascade. Something like (but not quite) snooker balls being hit and hitting each other transferring the momentum.
    And this ~frame of reference~ does not explain permanent magnets... :/

  • Thor Nielsen
    Thor Nielsen 11 дней назад

    I'd love a video explaining a photon in this fashion. A moving magnetic field generates an electric field. This electric field is moving and a moving electric field generates a magnetic field... On and on.. Forever

  • John DeF
    John DeF 11 дней назад +1

    Positively charged cat in a vacuum= vacation.🙀

  • aaronturkey
    aaronturkey 11 дней назад

    Magnets... How do they work??

  • Mr02071961
    Mr02071961 11 дней назад

    Somethıng doesn't fıt ın the story. If the densıty of posıtıve and negatıve charges ıs unchanged all the tıme ın the wıre (and ıt ıs),then ıt wıll remaın unchanged eıther you move along the wıre or stay stıll. So, even posıtıve charges occupy les space per unıt length due to relatıvıstıc contractıon, theır total number should remaın the same per unıt length = no repulsıon.

    • Mr02071961
      Mr02071961 6 дней назад

      If it is so, how to explain the effect on single photon travelling trough the vacuum? It consists of E field and M field that appear and disappear simultaneously. What is contracting in relation to what, in that case?

    • Woffenhorst
      Woffenhorst 6 дней назад

      It depends on the direction of motion, if the charged particle is moving "with" the electrons, they are moving slower/not at all, in relation to the particle and the holes going the other way are moving faster => more Lorentz contraction.

  • onehit pick
    onehit pick 12 дней назад

    This video is wrong on so many levels. The first is that a charged cat IS attracted to a neutral wire, in reality. This is because the charges in the neutral object polarize in response to a nearby charged object. In some cases you seem as if you understand some stuff, like with your understanding of angular momentum, and in other cases you seem completely unknowledgeable about the most basic physics.

  • Xo na
    Xo na 12 дней назад

    Had no idea electrons moved so slow in a wire.

  • Sonu Yadav
    Sonu Yadav 19 дней назад

    But when we kept magnet near the current carry wire ...the magnet deflect.....and the magnet isn't moving...??? How

  • Ordna Samot
    Ordna Samot 20 дней назад

    This aint how magnets or electro magnets work. Load of bogus

    • mrchapsnap
      mrchapsnap 6 дней назад

      Yea everyone knows it's miracles make them work duh

  • abhishek agarwal
    abhishek agarwal 21 день назад

    From which software could i edit my videos like this.

  • w00y07
    w00y07 21 день назад

    Everything clicks now thank you!

  • Arull Murugan S
    Arull Murugan S 24 дня назад +1

    I am a great fan of you and also special relativity. I always wanted to talk to you and ask a lot of questions which is infinite to my frame of reference

  • Arull Murugan S
    Arull Murugan S 24 дня назад +1

    Thank you . you helped me to fight with my friend about magnet.

  • AADITYA RANE
    AADITYA RANE 26 дней назад

    Right now u make me speechless

  • Ryne Smith
    Ryne Smith 29 дней назад

    How would this theory explain magnetic lines of force emanating out from the conductor such as a wire or electromagnet?

  • tomblanco2001
    tomblanco2001 Месяц назад

    The title should be "Special Relativity Theory Explains How Magnets Work." A theory does not make the world work, a theory provides a framework for understanding what we observe. On the other hand, it's hard to argue against over 1.5 million views.

  • Scarlet Speedster
    Scarlet Speedster Месяц назад

    Guys! I'm in a loophole.

  • Mathew Orman
    Mathew Orman Месяц назад

    That is a false picture as the electrons in wire move with accelerated motion and never in a straight line...

  • tom solomon
    tom solomon Месяц назад

    but the object feels the magnetic force without it moving at all. how is that happening? what is doing the movement of the positive cat?

  • VMEcycle6
    VMEcycle6 Месяц назад

    So based on this explanation.
    A single proton or a single electron moving in a space doesn't generate magnet field around its path?

  • Lina Engineer
    Lina Engineer Месяц назад

    I believe contracting is not real it only is a time it take force going relative distance which act like contracting. This idea make people confused because maybe not true for real space. It is good in math because distance change at each time and force move same velocity. Charge moves in wire but I believe never proton only electron but real is force only which make electron from universal field. Is ok if we say electron moves. I ask how charge forces are different so charge create fighting and some change direction point toward opposite ones? Maybe a same reason for create gravity from atoms making general relativity behavior?

  • bhaskar sai
    bhaskar sai Месяц назад

    What about the direction of the field

  • TANAY PATEL
    TANAY PATEL Месяц назад

    Can you explain about direction of the magnetic field..

  • Yuya fujikawa
    Yuya fujikawa Месяц назад

    Beautiful!! That's what special relativity is!

  • lvitch
    lvitch Месяц назад +2

    This couldn't be more incorrect.

  • Yuvi Bangarang
    Yuvi Bangarang Месяц назад

    but then, why the kitty cat doesn't experience a force when it is stationary and wire is havin a current, beacause then from cat's perspective, it's the electrons which are moving and they should contracted in space, must be creating a density imbalance which should cause a force to attract.!

  • Sean Fortescue
    Sean Fortescue Месяц назад

    I'm from India and in 10th standard your video helped me understand the magnetic effect of electric current really well so thank you and please keep up the good work..I have watched other videos on special relativity and E=mC2 and other high level even though I don't understand any of them completely yet they give me a good idea of how things work at the elementary level like I always wondered what actually causes magnetism in the first place why would an object attract another.. why does it produce a magnetic field while another material does not? Our 10th standard books don't explain that so once again thank you so much for these videos.

  • Gene Ruffalo
    Gene Ruffalo Месяц назад

    what a crock. relativity does NOT MAKE MAGNETS WORK. Magnetism existed before Einstein. May you should rephrase this to "magnetism make relativity available as ONE possible explanation for its existence". Keep eating what they are force feeding you. Come up with ZERO original ideas. Yes, that is the way to grow.

  • Impossible Physix
    Impossible Physix Месяц назад

    Can you explain induction with relativity

  • Akash Padhye
    Akash Padhye Месяц назад

    When cat is at rest and electrons are drifting then according to length contractions density of electrons should increase and cat should get attracted towards wire
    Why this thing doesn't happen????

  • Seth White
    Seth White Месяц назад

    from the first frame of reference, shouldn't the electric charges contract, creating a slightly negative charged wire?

    • Seth White
      Seth White Месяц назад

      actually wait, electrons have less mass than protons, so they would shrink less from the same relative speed

    • Seth White
      Seth White Месяц назад

      actually wait, electrons have less mass than protons, so they would shrink less from the same relative speed

  • Kyle MacDonald
    Kyle MacDonald Месяц назад

    Eric Mazur's webpage (linked in the description) is currently down. Do you have a source for this approach to EM? I only have Slater's book, which doesn't have this development in it.

  • mg1s
    mg1s Месяц назад +2

    Relativity is a fairy tail connecting a few known points of science. It is dogma of new faith. Like religion’s dogma you must not question it. You must believe it. it is myth. Myth is mixture of fact & fiction. with fiction you can make anything work. it is Schizophrenic. One moment speed of light is fixed, next moment it slow down. Become red shift. Next it will increase and become blue shift. Any religion has special interest behind it. they make sure the believers get rewarded and non believers are not heard. There is no interest if it is correct or false. relativity dose not make magnet work. atom make magnet work. MG1

  • endless nameless
    endless nameless Месяц назад

    I don't think this has anything to do with the contraction/expansion effect that the cat perceives. Perception does not govern the universe. If the cat is stationary relative to the wire, it is attracted to the moving negative current. If the cat is moving at the same speed and direction as the negative charge, then moving positive charge of the cat cancels the negative current of the electrons, and the protons of the stationary wire will repel the cat until the cat reaches a neutral distance.This has everything to do with charges in motion, and nothing to do with the fictitious cat's perception.  If a pair of + & - charge are moving in the same direction at the same speed, they cancel. Its that simple.

  • Sahid Barbar
    Sahid Barbar Месяц назад

    First mistake at 0:14 second....

  • AFG BOY
    AFG BOY Месяц назад

    ✋✋👋👋👋

  • DJFLLOUT
    DJFLLOUT Месяц назад

    However in your frame of reference (refer to approx. 3:15) are the ELECTRONS not moving (due to the current applied), and so the ELECTRONS will contract, making the wire more "electron-dense" and NEGATIVELY charged, theoretically attracting the Proton Cat?

  • santosh kumar KHADANGA
    santosh kumar KHADANGA Месяц назад

    then how can we explain the magnetic property of permanent magnets using spacial relativity?