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 / False: When entering the field the coil experiences a magnetic force to the left.
True / False: Upon entering the field, a clockwise current flows in the loop.
True / False: While the loop is entirely in the field, the emf in the loop is zero.
True / False: When leaving the field the coil experiences a magnetic force to the right.

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) True, because if it's entirely in the B field, the flux is not changing, so no induced EMF

d) True

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