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

If instantaneous current is given by `i=4 cos(omega t + varphi)` amperes, then the `r.m.s.` value of current is

A

`4` ampere

B

`2sqrt(2)` ampere

C

`4sqrt(2)` ampere

D

zero ampere

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The correct Answer is:
B
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