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.

a. When leaving the field the coil experiences a magnetic force to the right.

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

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

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

Explanation / Answer

While entering the field flux increases and so current flow clockwise. While leaving field region flux decreases and current flow anticlockwise.

While entering field due to clockwise current force acts on loop towards right and while leaving field due to anticlockwise current force acts towards left on loop.

So c. Upon entering the field, a clockwise current flows in the loop.  

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