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If instantaneous current is given by i=4...

If instantaneous current is given by i=4 cos `(omegat+phi)` ampere, than the rms value of current is ...... ampere.

A

4

B

`2sqrt2`

C

`4sqrt2`

D

0

Text Solution

Verified by Experts

The correct Answer is:
B
Compare `i=4 cos (omegat + phi)` with `i=i_r cos (omegat + phi) i_m` = 4A
`therefore i_(rms)=i_m/sqrt2 = 4/sqrt2 =2sqrt2A`
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