Question

A metallic ring connected to a rod oscillates freely like a pendulum. If now a magnetic field is applied in horizontal direction so that the pendulum now strings through the field, the pendulum will

• A. Keep oscillating with the old time period
• B. Keep oscillating with a smaller time period
• C. Keep oscillating with a larger time period
• D. come to rest very soon

Answer 1

The correct option is D come to rest very soon

As soon as ring will enter magnetic field an EMF will be induced in the ring.

This EMF will oppose the flux chaning,

Since the ring is of metal; it will have some resistance

Due to EMF opposition and resistance the energy of will slowly dissipate and the ring will come to rest very soon.

(Option -D)