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A magnetic needle of magnetic moment 6....

A magnetic needle of magnetic moment `6.7xx10^(-2)A.m^(2)` And moment of inertia `7.5xx10^(-6) "kg".m^(2)` Is performing simple harmonic oscillations in a magnetic field of 0.01 T. time taken for 10 complete oscillations is

A

`6.65s`

B

`8.89s`

C

`6.98s`

D

`8.76s`

Text Solution

Verified by Experts

The correct Answer is:
A
Time period , `T=2pisqrt((I)/(MB))=2pisqrt((7.5xx10-6)/(6.7xx10^(-2)xx0.01))`
`=6.65xx10^(-1)`
`therefore` Time taken for 10 complete oscillations
`=6.65xx10^(-1)xx10=6.65s`
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