 Quote by entropy15
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?
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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:
http://physics.fullerton.edu/~jimw/g...eact/index.htm
AM