Q.

A bar magnet is oscillating in the earth's magnetic field with a time period T. If the mass is quadrupled, then its time period will be

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a

T2

b

T

c

2T

d

4T

answer is C.

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Detailed Solution

T=2πIMBH=2πml212MBH∴T∝m∴T1T2=m4m=12⇒T2=2T1=2T
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