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Q.

A bar magnet suspended freely in uniform magnetic field is vibrating with a time period of 3 seconds.If the initial field strength is 2T, then the final field strength, for which time period becomes 4 seconds is

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a

1.125Tesla

b

0.625Tesla

c

3.55 Tesla

d

0.75 Tesla

answer is A.

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T=2πIMB and Tα1B
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