Q.

The time period of  a freely suspended magnet does not depend upon

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a

Length of the magnet

b

The pole strength of magnet

c

The horizontal component of earth’s magnetic field

d

Length of the suspension

answer is D.

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Detailed Solution

Explanation for  key :   (1) (2) & (3)   Time period of  oscillation of magnetic needle is                                T=2πIMBHWhere  M=m×2l1) By the above equation we say time period depends on magnetic length (2l)2)Magnetic pole strength3) Horizontal component of earth’s magnetic field.
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