A magnetic needle of magnetic moment 6.7 $\times$ 10-2 A m2 and moment of inertia 7.5 $\times$ 10-6 kg m2 is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is:

Question

A magnetic needle of magnetic moment 6.7 $\times$ 10^-2 A m² and moment of inertia 7.5 $\times$ 10^-6 kg m² is performing simple harmonic oscillations in a magnetic field of 0.01 T. Time taken for 10 complete oscillations is:

8.76 s