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In the circuit shown here, the voltage across E and C are respectively 300 V and 400 V. The voltage E of the ac source is :
The resultant source voltage $$E$$ is the magnitude of the phasor difference between $$V_L$$ and $$V_C$$: $$E = |V_L - V_C|$$
$$E = |300 - 400|$$
$$E = 100\text{ V}$$
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