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.
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