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An AC source is 120 V-60 Hz. The value...

An AC source is 120 V-60 Hz. The value of voltage after 1/720 s from start will be

A

8.48 V

B

6.48 V

C

84.8 V

D

88.4 V

Text Solution

Verified by Experts

The correct Answer is:
C
`e=e_(0)sinomegat`
`=e_(rms)sqrt(2)sin2pift`
`=120sqrt(2)sin2pi60xx(1)/(720)`
`=120sqrt(2)"sin"(pi)/(6)`
`=84.8V`.
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