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.

1. Upon leaving the field, a counterclockwise current flows in the loop. T/F

2. When entering the field the coil experiences a magnetic force to the right. T/F

3. When leaving the field the coil experiences a magnetic force to the right. T/F

4. Upon entering the field, a counterclockwise current flows in the loop. T/F

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. 1. Upon leaving the field, a counterclockwise current flows in the loop. T/F 2. When entering the field the coil experiences a magnetic force to the right. T/F 3. When leaving the field the coil experiences a magnetic force to the right. T/F 4. Upon entering the field, a counterclockwise current flows in the loop. T/F

Explanation / Answer

1)

False, when the loop is moving out of the field, the left hand side will be out of the magnetic field so no force will be on it. The current will be moving clockwise to counter the decrease in flux. The force on the top and bottom portions of the loop will cancel. The only remaining part is the right hand side. F = IL

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