A magnetic needle of magnetic moment ...

A magnetic needle of magnetic moment `6.7xx10 ^(-2) A.m ^(2)` and moment of inertia `7.5 xx10 ^(-6) Kg . M^(2)` is performing simple harmonic oscillations in a magnetic field of 0.01 T . Time taken for 10 complete osciallations is

`6.65 s`

`8.89 s`

`6.98 S`

`8.76 S`

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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

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