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 right. For each statement select T True, F False. (If the first is T and the rest F, enter TFFFF. )

A) Upon leaving the field, a counterclockwise current flows in the loop.

B) When leaving the field the coil experiences a magnetic force to the left.

C) While the loop is entirely in the field, the emf in the loop is zero.

D) Upon entering the field, a counterclockwise current flows in the loop.

Explanation / Answer

FTTTF

a) Upon leaving the field , no magnetic lines crossed by coil hence no induced emf and current flows

b) as magnetic force will try to take it back so it will be in left

c) While the loop is entirely in the field , no magnetic lines crossed by coil hence no induced emf and current flows

d) Upon entering the field , a counterclockwise current flows in the loop ( as induced magnetic filed will be in +z by having so which will oppose the applied field in -Z)

e)  as magnetic force will try to oppose it to enter so it will be in left

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