A magnetic needle of magnetic moment

Question:

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

  1. $6.98 \mathrm{~s}$

  2. $8.76 \mathrm{~s}$

  3. $6.65 \mathrm{~s}$

  4. $8.89 \mathrm{~s}$


Correct Option: , 3

Solution:

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