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Question

For an A.C given by 50cos(100t+45o)A. The value of Irms=_______ A

A
Zero
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B
502
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C
25
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D
252
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Solution

The correct option is C 252
Comparing the equation by
I=I0cos(ωt+ϕ)

Here, I0 is the maximum peak voltage.
I0=50A

The RMS voltage is obtained as:
Irms=I02

=502=252A

Option D is the correct answer.

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