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Assertion An emf is induced in a long solenoid by a bar magnet that moves while totally inside the solenoid along the axis of the solenoid. Reason As the magnet moves inside the solenoid the flux through individual turns of the solenoid changes.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Correct answer: Assertion is incorrect but Reason is correct

Solution

The reason is true because the magnetic flux through each turn can change as the magnet moves. However, the assertion is false for an ideal long solenoid when the magnet remains totally inside and moves along its axis, since the net flux linkage of the entire solenoid does not change in the way needed to induce emf.

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