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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

`8.76s`

B

`6.65s`

C

`8.89s`

D

`6.98s`

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The correct Answer is:
B
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