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A resistance of 7 ohm is connected in series with an inductance of 31.8mH. The circuit is connected to a x V 50Hz sinusoidal supply. The current in the circuit is 8.2A. Calculate the value of x.

Correct Answer: 100V
XL=2*π*f*L= 10 ohm. Z2=(R2+XL2) Therefore, the total impedance Z = 12.2ohm. V=IZ, therefore V = 12.2*8.2 = 100V.

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