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The rms value of a sinusoldal ac current...

The rms value of a sinusoldal ac current is equal to its instantaneous value at an angle of _________ degree.

A

`30^(@)`

B

`60^(@)`

C

`90^(@)`

D

`45^(@)`

Text Solution

Verified by Experts

The correct Answer is:
D
`I = I_(0) sin omega t`
`I_(rms) = (I_0)/(sqrt(2)) :. (I_(0))/(sqrt(2)) = I_(0) sin omega t`
`:. sin omega t = 1/(sqrt2) :. theta = 45^(@)`.
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MARVEL PUBLICATION-ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENTS -TEST YOUR GRASP - 16
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