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. Upon entering the field, a clockwise current flows in the loop.
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. When entering the field the coil experiences a magnetic force to the left.

Explanation / Answer

Ans : True

Reason : Best Answer:  1)True
Before entering the field, the magnetic flux through the coil is zero. Upon entering the field, the flux is out of the plane of figure because magnetic field is out of the plane of figure. So, the change in flux is out of the plane of figure.
Therefore, the current in the loop is such that the flux produced by it is into the plane of figure. For that the magnetic field produced by the current should be into the plane of figure. This is possible when the current is clockwise.

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