Question

Assertion : The needle of a magnetic compass kept in strong external magnetic field, always aligns itself in north-south direction on the earth. Reason (R): Behaviour of the needle of a compass is same as that of a freely suspended bar magnet.

• A. Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
• B. Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
• C. Assertion (A) is true, but Reason (R) is false.
• D. Assertion (A) is false, but Reason (R) is true.

Hint:

Compass aligns with strongest magnetic field present.

Answer 1

The Correct Option is D

Explanation:

• A compass needle aligns along the direction of the strongest magnetic field acting on it.
• If a strong external magnetic field is present, the needle will align with that field, not necessarily in the Earth's north-south direction.
• Hence, the assertion is false.

Reason Analysis:

• A compass needle behaves like a small freely suspended bar magnet.
• Therefore, the reason is true.

Conclusion: Assertion is false but reason is true. Hence, option (D) is correct.