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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 period T. What happens to its period and motion if its mass is quadrupled

A

Motion remains S.H. with time period = T/2

B

Motion remains S.H. with time period = 2T

C

Motion remains S.H. with time period = 4T

D

Motion remains S.H. with time and period remains nearly constant

Text Solution

Verified by Experts

The correct Answer is:
B
use `T=2pisqrt(1/"MB")`
`because 1 prop` mass `rArr T'=2pisqrt((4I)/(MB))=2T`
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