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A 47 Ω resistor is in series with an inductive reactance of 120 Ω across an ac source. The impedance, expressed in polar form, is

47∠68.6° Ω
120∠68.6° Ω
129∠31.4° Ω
129∠68.6° Ω

Correct Answer: 129∠68.6° Ω

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