Direction for: In each of the following questions a statement of Assertion is given followed by a corresponding statement of Reason just below it. Of the statements mark the correct answer as
Assertion: If a compass needle be kept at magnetic north pole of the earth, the compass needle may stay in any direction. Reason: Dip needle will stay vertical at the north pole of earth.A) If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion.
B) If both Assertion and Reason are true but the Reason is not the correct explanation of the Assertion.
C) If Assertion is true but Reason is false.
D) If both Assertion and Reason are false.
Correct Answer: B
Solution :
We know that at magnetic poles the horizontal component of earths field is zero, only vertical component exists. So, as compass needle is free to rotate in horizontal plane and is thus effected by horizontal component only as \[I\], hence compass needle may stay in any direction. The dip needle rotates in a vertical plane and the angle of dip at poles is 90°. Hence, the dip needle will stand vertical at the north pole of earth.
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