Two coils have a mutual inductance $0.005 \, H$. The current changes in the first coil according to the equation $I = I_0 \sin(\omega t)$,where $I_0 = 10 \, A$ and $\omega = 100\pi \, rad/s$. The maximum value of the $e.m.f.$ in the second coil is:
- A$2\pi \, V$
- B$5\pi \, V$
- C$\pi \, V$
- D$4\pi \, V$
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