Linked Questions

2
votes
2answers
4k views

Can magnetic force do work? [duplicate]

I have been told numerous times that magnetic force do no work at all but I have some trouble digesting this fact. Now suppose we have two straight wire with some current, they certainly can feel ...
2
votes
1answer
550 views

Work done by magnetic forces [duplicate]

I have read in textbooks (such as Griffiths electrodynamics) that magnetic forces do no work. Then i don't see how a magnetic force does no work when a magnet is attracting or repelling another magnet....
73
votes
9answers
14k views

How can magnets be used to pick up pieces of metal when the force from a magnetic field does no work?

I learned that the force from a magnetic field does no work. However I was wondering how magnets can be used to pick up pieces of metal like small paperclips and stuff. I also was wondering how ...
14
votes
2answers
11k views

Conservation of Energy in a magnet

When a permanent magnet attracts some object, lets say a steel ball, energy is converted into for instance kinetic energy and heat when attraction happens, and they eventually collide. Does this imply ...
15
votes
2answers
2k views

What is the mechanism by which magnetic fields do work?

I've seen some conflicted answers to this question in texts and on the web, in the case of a dipole, for example. Do magnetic fields do work directly, or is it their induced electric fields that do ...
3
votes
4answers
1k views

How can I use a magnet to lift a paperclip?

This question has been asked already, but no satisfying answer came up. All the answers seem to push the problem further, but do not explain clearly what is going on. I will reformulate it for a ...
1
vote
2answers
3k views

Work is not done by the magnetic field?

According to my text book: The Lorentz Force F on a charged particle moving in an electromagnetic field is given by: $$F= qE + q(v\times B)$$ then it states that "it is to be pointed out that only ...
3
votes
2answers
587 views

Experimental evidence showing the kinetic energy of an electron changes in a static non-uniform magnetic field?

In a previous question, Does a magnetic field do work on an intrinsic magnetic dipole?, one highly rated answer suggested that static magnetic fields do work on intrinsic magnetic dipoles in a non-...
3
votes
2answers
316 views

When work is performed solely by magnetism, is there an equivalent loss of energy from the magnetic field?

When two magnets are placed within appropriate proximity and released, the attractive force will perform work and bring them together. Work is performed overcoming friction. Can we measure a ...
0
votes
1answer
174 views

Real QM cause of magnetic dipole moment

I have read these questions: Relation between magnetic moment and angular momentum -- classic theory Why is the electron magnetic moment always parallel to the spin for an electron? Does a magnetic ...
-1
votes
4answers
409 views

Who foots the (magnetic) energy bill?

Gravitational attraction and electrostatic attraction/repulsion are intrinsic properties of matter, any particle (electron, proton) for some unknown reason can produce KE at a distance. But magnetic ...