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Two bar magnets having same geometry wit...

Two bar magnets having same geometry with magnetic moments M and 2M, are firstly placed in such a way what their similar poles are same side then its time period of oscillation is `T_1`. Now the polarity of one of the magnet is reversed then time period of oscillation will be:-

A

`T_1 lt T_2`

B

`T_1=T_2`

C

`T_1 gt T_2`

D

`T_2=oo`

Text Solution

Verified by Experts

The correct Answer is:
A
`T=2pisqrt(1/"MB")rArr T prop 1/sqrtM`
case I:`M_1=2M+M`
Case II: `M_2=2M-M`
`T_1/T_2 =sqrt(M/(3M))=1/sqrt3rArr T_2=sqrt3T_1`
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