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

ID: 1360140 • Letter: A

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. The self inductance of the loop is negligible. When entering the field the coil experiences a magnetic force to the left. When leaving the field the coil experiences a magnetic force to the left. Upon entering the field, a counterclockwise current flows in the loop. Upon leaving the field, a counterclockwise current flows in the loop. Tries 3/12 Previous Tries

Explanation / Answer

while entering, current will be such that magnetic field due to current will oppose the original magnetic field. So field created by current must be coming up.So current must be counterclockwise.

while exiting, current will be such that magnetic field due to current will support the original magnetic field. So field created by current must be going in.So current must be clockwise.
Force will be 0

So only option 3 is true. Rest all are false

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