In a circuit made up of a resistance $4\,\Omega$ and an inductance $0.01\,H$,an alternating $emf$ of $200\,V$ at $50\,Hz$ is connected. The phase difference between the current and the $emf$ in the circuit is:
- A$\tan^{-1}\left(\frac{\pi}{4}\right)$
- B$\tan^{-1}\left(\frac{\pi}{3}\right)$
- C$\tan^{-1}\left(\frac{\pi}{2}\right)$
- D$\tan^{-1}(\pi)$
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