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A horizontal solenoid is connected to a battery and a switch. A copper ring is placed on a frictionless track, with the axis of the ring along the axis of the solenoid. As the switch is closed, the ring will

1. remain stationary
2. move towards the solenoid
3. move away from the solenoid
4. move towards the solenoid or away from it depending on which terminal (positive or negative) of the battery is connected to the left end of the solenoid

Correct answer: move away from the solenoid

Solution

On closing the switch, current in the solenoid rises from zero, so magnetic flux through the ring increases. By Lenz's law, the induced current in the ring opposes this increase, producing a repulsive interaction with the solenoid. Hence the ring moves away.

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