The peak value of an alternating e.m.f. $E$ given by $E = E_0 \cos \omega t$ is $10 \ V$ and its frequency is $50 \ Hz$. At time $t = \frac{1}{600} \ s$,the instantaneous e.m.f. is:
- A$10 \ V$
- B$5\sqrt{3} \ V$
- C$5 \ V$
- D$1 \ V$
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