Assertion (A) : It is difficult to move a magnet into a ...

CBSE Class 12 Physics 2025 All Sets Solved Paper

Question : 15 of 16

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Assertion (A) : It is difficult to move a magnet into a coil of large number of turns when the circuit of the coil is closed.
Reason (R) : The direction of induced current in a coil with its circuit closed, due to motion of a magnet, is such that it opposes the cause.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of Assertion (A)
Assertion (A) is true, but Reason (R) is false
Assertion (A) is false and Reason (R) is also false

Solution:

Assertion (A): True : Moving a magnet in a coil with a large number of turns induces a greater back EMF, making movement difficult.
Reason (R): True : According to Lenz's Law, induced current opposes the change causing it.

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