1.

A 12 ohm resistor and a 0.21 henry inductor are connected in series to an ac source operating at 20 volts, 50 cycle/second. The phase angle between the current and the source voltage is                                   [BHU 1994]

A. 30°
B. 40°
C. 80°
D. 90°
Answer» D. 90°


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