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Question

An alternating current is given by the equation i=i1 cos ωt+i2 sin ω t. The r.m.s. current is given by

A
12(i1+i2)
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B
12(i1+i2)2
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C
12(i21+i22)12
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D
12(i21+i22)12
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Solution

The correct option is C 12(i21+i22)12
irms=i21+i222=12(i21+i22)12

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