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A bar magnet is oscillating in the earth...

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:

A

`T//2`

B

`T`

C

`2T`

D

`4T`

Text Solution

Verified by Experts

The correct Answer is:
C
`T=2pisqrt(I/(MH))=2pisqrt((ml^(2))/(12(MH)))`
`:. T prop sqrt(m)`
`:. T_(1)/T_(2)=sqrt(m/(4m))=1/2impliesT_(2)=2T_(1)`
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