Time period of oscillation of a magnet is 2 sec. When it is remagnetised

Time period of oscillation of a magnet is 2 sec. When it is remagnetised so that its pole strength is 4 times, its period will be

(a) 4 sec
(b) 2 sec
(c) 1 sec
(d) 8 sec

1 sec

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KL2002

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