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.

Answer True or False:

a. While the loop is entirely in the field, the emf in the loop is zero.
b. When leaving the field the coil experiences a magnetic force to the left.
c. When entering the field the coil experiences a magnetic force to the right.
d. Upon entering the field, a counterclockwise current flows in the loop.

Explanation / Answer

Given

In

Lenz's law

In the magnetic field is into the page

a square loop moving in the magnetic field from magnetic field frre region to constant magnetic field region

so as

A)

true

no change in magnetic field ,hence no emf generated

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

C) When entering the field the coil experiences a magnetic force to the left. False

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

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