Suppose there is a square conducting wire in a magnetic field. The two vertical branches will have the same emf, and the two horizontal branches will have 0 emf, resulting in a net emf of zero and zero current. Now, suppose the magnetic field disappears. Faraday's law says that there should be an induced emf. My question is, how does that work? Wouldn't the two opposite branches still have the same emf, leading to a net of zero and no current?
I really hope the answer is something that'll make me smack my head, because it's bugging me no end.