Question

A copper ring is moved towards the north pole of a bar magnet. Then

• A. the ring will not be affected
• B. the ring all tend to get warm
• C. an alternating current will flow in the ring
• D. the ring will be positively charged

Answer 1

Answer: (B)

the ring all tend to get warm

When the copper ring is moved towards the north pole of the magnet, induced emf is generated in the ring according to the electromagnetic laws of induction. Now current in the ring due to induced emf will generate heat in the ring according to the Joule's law. Thus the copper ring tends to get warm.