Can Magnets Do Work?

  • Added:  5 days ago
  • It's often said that "magnetic force cannot do work." This video is my challenge to this long-taught physics rule.
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    VIDEO ANNOTATIONS/CARDS

    Bonds Do NOT Have Energy!
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    Noether's Theorem Explained:
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    Magnetic Force Does NOT Exist!
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  • Video CategoriesEducation
  • Runtime: 5:4
  • Tags for this video:  magnets  magnetism  energy  physics  force  displacement  

Comments: 45

  • Rodney Smith
    Rodney Smith 3 days ago

    Something I never thought about..... does a magnet that pulls another magnet to itself use up some energy, and the resultant magnetic field is weaker?

    • The Science Asylum
      The Science Asylum 1 day ago

      When you put a paperclip on a magnet, that paperclips electrons line up turning it into another magnet. That has a distance limit though.


    • Rodney Smith
      Rodney Smith 3 days ago

      So is that why when you make a chain of paperclips off a magnet the force to hold up the next one gets less and less?


    • The Science Asylum
      The Science Asylum 3 days ago

      It does actually. If work is being done, energy is being transformed. That energy has to come from somewhere and it comes from the magnets.


  • Rodney Smith
    Rodney Smith 3 days ago

    My intro Physics class instead stated this as "It takes no work to move a charged particle along a magnetic field line"

    • The Science Asylum
      The Science Asylum 3 days ago

      That's more accurate, but physics likes it's rule to be a little more broad than that.


  • STORM CAPRICON
    STORM CAPRICON 4 days ago

    I have a question ....... so when earth's magnetic field is present which is very strong and we have wire long enough from north pole to the south pole what would happen to the current flowing ( current flowing from north pole to south pole ) ????? Will it go in upward direction like you said ( west or east ) ???

    • The Science Asylum
      The Science Asylum 3 days ago

      Well, the magnetic field lines also go from the north pole to the south pole, so if you had a wire from the north pole to the south pole then it wouldn't do anything. Cross products go to zero when things line up. To get the most to happen, you'd have to lay the wire from east to west at the equator. With _a lot_ of electric current (like 150 amps), you could get the wire to levitate.


  • Legojoker
    Legojoker 5 days ago

    This channel deserves more subscribers. Excellent video quality and audience interaction, keep it up.

  • Guest Informant
    Guest Informant 5 days ago

    0:14 Can I question why there's a question mark after "Question Everything"?

  • Benbedra Abdssamad
    Benbedra Abdssamad 5 days ago

    There are indeed two types of magnetic forces: a force related to the electric charge and a force related to the magnetic dipole moment as in the Stern-Gerlach experiment, the later can do work if it applied to magnetic dipoles such as atoms.

    • The Science Asylum
      The Science Asylum 3 days ago

      Those forces obey the same fundamental laws though. The _laws_ don't distinguish between them even if _we_ want to.


  • Louis-Philippe Chiasson

    Insightful, funny, great 'work' as usual!

  • K8UR Channel
    K8UR Channel 5 days ago

    Excellent!

  • LouisPowell
    LouisPowell 5 days ago

    I'm very satisfied by this video. I'm a big fan of magnets.

  • Avanish Padmakar
    Avanish Padmakar 5 days ago

    if motion leads to length contraction than anything could only contract until plank length so speed limit should be corresponding to that so can we use this to calculate c.also how does information and charge obey noethers theorem??

  • MrDrProf
    MrDrProf 5 days ago

    Fucking magnets, how do they work?

  • Daniel Guevara
    Daniel Guevara 5 days ago

    Wait I think i misunderstood, in the case of the single particle since its velocity vector is constantly changing direction it is under acceleration. A centripetal force is being applied to the particle which means you are doing work to move the particle. if you increase the strength of the magnetic field the particle will rotate more quickly, and it will gain kinetic energy correct?

    • Daniel Guevara
      Daniel Guevara 5 days ago

      that makes sense thanks!


    • The Science Asylum
      The Science Asylum 5 days ago

      Ah, but if you increase the strength of the magnetic field, the circle also gets smaller. Work isn't done in perfectly stable circular motion.


  • Sir Penguin
    Sir Penguin 5 days ago

    Love this amazing channel

  • Janek Świercz
    Janek Świercz 5 days ago

    Awesome video <33

  • The Religious Atheist Bakchodi Corner

    First 200 viewers' club!!!

  • Patrick Skelton
    Patrick Skelton 5 days ago

    hey I was told that the work done by a magnet in this instance is due to a changing magnetic force which induces an electric field which is what actually does the work it's a little silly kinda like how the normal force in classical mechanics does no work but it can redirect your pushing force to move an object up a slope similarly a magnetic force doesn't do work but it can redirect an electric force or at least that's how I understand it !?

    • The Science Asylum
      The Science Asylum 1 day ago

      The Lorentz force applies to individual charges only. It isn't some universal law that applies to everything. Also, David Griffiths is a bit condescending in his writing, so statements he makes tend to come across more "broad" than they should.


    • caio henrique
      caio henrique 5 days ago

      Section 8.3 of that book isn't *a silly argument*, just because it's not intuitive doesn't mean it's wrong. All the calculations are there. Like the author said, if you think you have discovered an exception in which magnetic forces do work, then please explain why Lorentz law is incorrect.


    • Patrick Skelton
      Patrick Skelton 5 days ago

      ha yeah that is exactly where it's from I think your right it's just as technically the magnetic force is just the electric force in a different reference frame... but yeah that's a silly argument it's like saying gravity does no work Ill have to give you the argument great video love this channel :)


    • The Science Asylum
      The Science Asylum 5 days ago

      That sounds like it's straight out of that book Nerd Clone is holding. It seems like a silly argument for a physics teacher to make when you've got a perfectly simple magnetic force that could do it.


  • blackcarbon95 しょう

    that insect sex though...

  • Andy Kirkham
    Andy Kirkham 5 days ago

    Excellent as usual!

  • Gristle Von Raben
    Gristle Von Raben 5 days ago

    good video

  • Science Asylum Fan
    Science Asylum Fan 5 days ago

    please can you explain why 8 electrons in the outer shell is the most stable configuration???? Why octet rule of chemistry holds true. Why noble gases are stable ? Why is it that octet is stable?? not 7,6,5,4 electrons? Why every atom wants to complete octet to attain stability????

    • SuperSaiyanShaak
      SuperSaiyanShaak 4 days ago

      The short answer is that when you (quantum mechanically) calculate the energies of the different subshells (or orbitals is more correct) for an atomic system you see that there are big energy gaps between certain subshells. Where these big gaps occur you call it a new shell ( subshells are classfied based on their angular symmetries) . When a shell is not completely filled it does not cost much energy to add or lose an electron because the subshell just above or below the outermost electron only differs slightly in energy and reactions can thus easily happen. If a shell is completely filled adding an electron cost a lot of energy so this wont happen often( losing an electron is a bit more subtle)


    • Science Asylum Fan
      Science Asylum Fan 5 days ago

      Legojoker Exactly!! That's what I mean.


    • Legojoker
      Legojoker 5 days ago

      @The Religious Atheist Bakchodi Corner He's asking about the fundamental principle of why that particular number is stable. Not how humans make nomenclature in an attempt to explain fundamental reality but really end up catching large capacities of the population in shallow answers. The "s p d f, etc. subshells and orbitals" are just geometrically predefined constraints we've placed on the system in an attempt to simplify it. Doesn't answer why this particular geometric and numerical arrangement is mathematically or geometrically stable in the universe we live in.


    • Science Asylum Fan
      Science Asylum Fan 5 days ago

      The Science Asylum OMG!! You're the best teacher ever. please don't forget this.I am eagerly waiting to learn from the best teacher in the world.


    • The Religious Atheist Bakchodi Corner
      The Religious Atheist Bakchodi Corner 5 days ago

      Fabulous Stuff Even I'm in class 10, but this is class 11 stuff. But yes, I know it (psst: I'm a genius ;p)


  • Kamron Brinkerhoff
    Kamron Brinkerhoff 5 days ago

    I thought the fundamental question would be "Magnets. How do they work?

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