The instantaneous values of current and emf in an $AC$ circuit are $I = 1/\sqrt{2} \sin(314t) \, A$ and $E = \sqrt{2} \sin(314t - \pi/6) \, V$ respectively. The phase difference between $E$ and $I$ will be
- A$-\pi/6 \, rad$
- B$-\pi/3 \, rad$
- C$\pi/6 \, rad$
- D$\pi/3 \, rad$
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