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Q.

The period of oscillations of a magnet is 2 s. When it is remagnetised so that the pole strength is 4 times, its period will be

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a

4 s

b

2 s

c

1 s

d

12 s

answer is C.

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Detailed Solution

T∝1M⇒T∝1mIf m → 4 times, then T→12 times i.e., T'=T2=22=1 s
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