NEET Physics Earth's Magnetism Assertion Reason Question
Assertion (A): At the magnetic poles, a compass needle cannot point along the magnetic meridian.
Reason (R): The horizontal component of the earth's magnetic field is zero at the magnetic poles.
Both A and R are true, and R is the correct explanation of A.
Both A and R are true, but R is not the correct explanation of A.
A is true but R is false.
A is false but R is true.
Correct Answer
Detailed Explanation
At the magnetic poles, the magnetic field lines are vertical, making the horizontal component of the earth's magnetic field zero. This causes the compass needle, which aligns with the horizontal component, to not point along any meridian.
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