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A coil, having both resistance and inductance, has a total effective

impedance of 50 Ω and the phase angle of the current through it with

respect to the voltage across it is 45° lag. The coil is connected in

series with a 40 Ω resistor across a sinusoidal supply (Fig. 10.15). The

circuit current is 3.0 A; by constructing a phasor diagram, estimate

the supply voltage and the circuit phase angle