A square loop of wire with a small resistance is moved with constant speed from

Question

A square loop of wire with a small resistance is moved with constant speed from a field free region into a region of uniform B field (B is constant in time) and then back into a field free region to the right. For each statement select T True, F False. (If the first is T and the rest F, enter TFFFF.) When entering the field the coil experiences a magnetic force to the right. While the loop is entirely in the field, the emf in the loop is zero. Upon leaving the field, a clockwise current flows in the loop. Upon entering the field, a clockwise current flows in the loop. When leaving the field the coil experiences a magnetic force to the left.

Explanation / Answer

a. False (magnetic force opposes motion hence to left)

b. True (No flux change)

c. true (left side wire of the loop will expirience magnetic force to left when current is clockwise, which oppose the right motion)

d. False (anti clockwise, because that way only the magnetic force on right side wire of loop will expirience left force)

e. True (coil always expiriences force to left as that is required to oppose the motion)

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