1.

The peak value of an alternating e.m.f. E is given by \[E={{E}_{0}}\cos \omega \,t\]is 10 volts and its frequency is 50 Hz. At time\[t=\frac{1}{600}sec\], the instantaneous e.m.f. is [MP PMT 1990; MP PET 2004]

A.            10 V        
B.            \[5\sqrt{3}\,V\]
C.            5 V
D.   1 V
Answer» C.            5 V


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