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Q.

At a certain place, a magnet makes 30 oscillations per minute. At another place where the magnetic field is double, its time period will be

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a

4 s

b

2 s

c

12 s

d

2 s

answer is D.

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Detailed Solution

T=2πIMBH;    ∴T1T2=BH2BH1⇒T2=T1BH1BH2Here n1 = 30 oscillations /min =12 oscillation/s∴T2=2BH2BH=2 x 12=2 s
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