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An alternating current is given by i=i1 ...

An alternating current is given by `i=i_1 sin omegat+i_2 cos omegat`. The r.m.s. Current is given by

A

`(i_1+i_2)/sqrt2`

B

`(i_1-i_2)/sqrt2`

C

`sqrt((i_1^2+i_2^2)/2)`

D

`sqrt((i_1^2+i_2^2)/sqrt2)`.

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