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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 increased four times, then its time period will be:

A

`4T`

B

`2T`

C

`T`

D

`T//2`

Text Solution

Verified by Experts

The correct Answer is:
B
`T=2pisqrt(I/(MB_(H)))`, where `I=(w(L^(2)+b^(2)))/12`
(w= Mass of magnet)
implies `T prop sqrt(w)`, If `wrarr` four times `Trarr` Two times
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