A magnetic dipole of magnetic moment $6 \times 10^{-2}\,\text{A}\,\text{m}^2$ and moment of inertia $12 \times 10^{-6}\,\text{kg}\,\text{m}^2$ performs oscillations in a magnetic field of $2 \times 10^{-2}\,\text{T}$. The time taken by the dipole to complete $20$ oscillations is ($\pi \cong 3$)