Alternating Current

The peak value of an alternating emf '\(\mathrm{e}\)' given by \(\mathrm{e}=\mathrm{e}_0 \cos \omega \mathrm{t}\) is 10 volt and its frequency is \(50 \mathrm{~Hz}\). At time \(\mathrm{t}=\frac{1}{600} \mathrm{~s}\), the instantaneous e.m.f is \(\left(\cos \frac{\pi}{6}=\sin \frac{\pi}{3}=\frac{\sqrt{3}}{2}\right)\)