Question 12

A bar magnet is released from rest along the axis of a very long vertical copper tube. After some time the magnet will

Solution

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When a bar magnet falls through a copper tube, changing magnetic flux induces eddy currents in the tube. These currents create a magnetic field opposing the magnet's motion (Lenz's law), providing a retarding force. Eventually, the retarding force balances gravity, and the magnet moves with almost constant (terminal) speed.

The correct answer is Option 3.

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