An alternating e.m.f. is given by E=10 c...

An alternating e.m.f. is given by `E=10 cos omega t`. If the frequency is 50 Hz, then at time `t=(1/600)s` the instantaneous value of e.m.f. is

A

5 volt

B

1 volt

C

10 volt

D

`5sqrt(3)` volt

Text Solution

Verified by Experts

The correct Answer is:

D

`e = 10 cos (2 pi ft) = 10 cos [2pi xx 50 xx 1/600]`
`=10 cos (pi)/6 = 10 xx (sqrt3)/2 = 5 sqrt(3) V`.

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