An alternating current is given by \( \mathrm{i}=\mathrm{I}_{1} \si...

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An alternating current is given by \( \mathrm{i}=\mathrm{I}_{1} \sin \omega t+ \) \( \mathrm{I}_{2} \cos \omega \). Then the rms current is given by
-(1) \( \frac{I_{1}+I_{2}}{2} \)
(2) \( \sqrt{\frac{I_{1}^{2}+I_{2}^{2}}{2}} \)
(3) \( \sqrt{\frac{\left.\right|_{1} ^{2}+I_{2}^{2}}{\sqrt{2}}} \)
(4) \( \frac{\sqrt{l_{1}^{2}+I_{2}^{2}}}{2} \)
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