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 left. The self inductance of the loop is negligible.

True or False.

1) When entering the field the coil experiences a magnetic force to the left.

2) Upon leaving the field, a clockwise current flows in the loop.

3) When leaving the field the coil experiences a magnetic force to the left.

4) Upon entering the field, a clockwise current flows in the loop.

(please explain! thanks!)

Explanation / Answer

a)False, because while entering the field according to lenz law, the field will try to oppose it towards the right. b)False, because while leaving the field the loop will try to maintain the magnetic field as stated by lenz law. c)False, because while leaving the field, the field will try to oppose it motion while leaving and the coil will feel a force towards right. d)True, while entering the field, the loop try to oppose the magnetic field so the cuurent in the loop is in clockwise direction.

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