An alternating voltage is given by: $e = e_1 \sin \omega t + e_2 \cos \omega t$. Then the root mean square $(RMS)$ value of the voltage is given by:
- A$\sqrt{e_1^2 + e_2^2}$
- B$\sqrt{e_1 e_2}$
- C$\sqrt{\frac{e_1 e_2}{2}}$
- D$\sqrt{\frac{e_1^2 + e_2^2}{2}}$
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