NEET Physics Earth's Magnetism Assertion Reason Question
Assertion (A): At the magnetic poles of the Earth, a compass needle becomes unreliable.
Reason (R): The magnetic field lines at the poles are parallel to the surface of the Earth.
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.
Correct Answer
Detailed Explanation
The assertion is true because at the magnetic poles, the vertical component of Earth's magnetic field dominates, making the compass needle unreliable. However, the reason is false as the magnetic field lines at the poles are actually vertical.
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