Physics/relativity question.?

Question

Imagine an object with charge Q moving along the ground with speed v through a uniform upward magnetic field of strength B. There is a force of strength QvB on the charged particle. Now imagine an observer moving at the same velocity as the particle. To that observer, v=0. But according to Newton and Galileo, the particle must experience the same force F as before. How can this be? The moving observer sees v=0, so can there be a magnetic force? If not, what kinds of forces can there be instead? If yes, how do you resolve the velocity problem?

Answer 1

The field in the rest frame of the object is purely magnetic. However, if we establish an IRF moving at velocity v through that field, we find that we see no magnetic field at all (as you say) but we DO see an electric field. The moving observer observes that the particle experiences a force, but attributes that force to an electric field rather than a magnetic field.

Answer 2

Good observation. The magnetic field is really an illusion. All magnetic fields are created by moving charge (At the present accepted understanding of physics). Once the charge stops moving relative to you it will appear that the magnetic field has stopped, and it has from your reference.

The force that pushes the charge up when you are moving with it will be due to an electric field that arise from the source of the magnetic field.

Heres another thing, imagine you see a charged object sitting on the ground and you run by it. That charged object will appear to have a magnetic field now , circulation around it...its all relative.

Equation that show the relation between electric and magnetic fields are called the maxwell equations...the math may be a bit dense but..just read the explanations.

Answer 3

My physics is a bit rusty, but surely the velocity of the object relative to the observer does not affect the velocity of the object relative to the magnetic field and therefore of the force applied to the object by the magnetic field.

I mean there are no forces being applied between the observer and the object are there?

Answer 4

Well, to not offend you or some thing, however there are a few info that you just have got to suppose approximately earlier than due to the fact that the alchemy in FMAB is anything that may make you a "GOD". There are a number of legislation mentioned in each the anime and the manga that contradict with that thought, given that you're as much as, a minimum of, episode nine =.= In Volume two Chapter 7 of the Manga, whilst Ed and Al first meats Scar; Armstrong introduces the levels via alchemy. "Analysis, Deconstruction, Reconstruction." Using elements round you, try to "see" what you wish to create, decompose that fabric in its rawest sort, and rebuild it into a brand new fabric. Your elements have got to have the correct factors in an effort to reconstruct the brand new "substance" it on your picture. You cannot simply have a few random fabric (a field and switch it into an iPhone with the nanites) via this regulation of alchemy. Example of Process: See a block of steel. (Analysis) Break it down (Deconstruction). Turn it right into a lance (Reconstruction) Episode two suggests that you just cannot revive the useless with out following the regulation of an identical trade. Resurrecting their mom rate Alphonse's existence and Edward's left leg. If you wish to create anything new, you ought to quit anything in trade. It's no longer like "POOF. LOOK AT ME! I AM MAGICAL!" It simply does not paintings that means. (I ought to say that Himoru Arakawa, the writer, used to be remarkable for imagining those legislation that gave the bottom to this manga/anime) And in case you suppose they are able to construct spacecrafts or whatnot, it is a fable sort of atmosphere, quite revolving across the early 1900s. They did not have spaceships or mobile phones that we've got in these days.  I advise that you just hold to observe the anime seeing that the plot is particularly deep and emotional. There many morals which might be discreetly acknowledged and, within the later episodes, it will get increasingly elaborate, as much as the factor that you just had to take a seat down and suppose approximately it once more (I had to try this a couple of occasions). See the way you find it irresistible after looking a few extra. I wish this helped.  --Masticate

Answer 5

The first answer is right. There's a good discussion of this in David Griffiths' Introduction to Electrodynamics book. I encourage you to get that book and look it up.