A 12 ohm resistor and a 0.21 h inductor


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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 sources voltage is

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XL = 2π50 x 0.21 = 66
Z = √12*12 + (XL)^2 = √144+(66)^2 =√ 4500 =30√5.
Now, cos(angle)=R/Z = 12/30√5 = 2/5√5
hence, angle= 80

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