A sensitive ammeter is connected to a wire loop and placed within the magnetic field of a strong horseshoe magnet.The ammeter shows a deflection when:
A)the wire is moved parallel to the field.
B)the wire is moved perpendicularly to the field.
C)neither wire nor magnet is moving.
D)the wire's axis is parallel to the field.

Question

Quizplus · Accepted Answer

When the wire is moved perpendicularly to the magnetic field, a current is induced in the wire according to Faraday's law of induction. This current is what causes the deflection in the ammeter. Moving parallel to the field (A and D) does not induce a current, and no motion (C) means there is no change in the magnetic field to induce a current.

A Sensitive Ammeter Is Connected to a Wire Loop and Placed