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Andrew Mason
Dec27-12, 02:24 PM
Sci Advisor
HW Helper
P: 6,684
Quote Quote by entropy15 View Post
What exactly do you mean by the reaction force in this case? Is it the resistance experienced by the magnet and does it feel the reaction instantaneously as it starts to move?
Yes. It appears that it does. But it is complicated.

Feynman's work led to a very successful theory of quantum electrodynamics and earned him the Nobel prize. Here is a bit of an explanation of the reaction force: