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A coil has resistance 6 ohm and reactance 8 ohm in series. Its power factor is
A0.8
B1.0
C0.75
D0.6
Answer & Solution
Correct answer: D. 0.6
Z is sqrt(36 + 64) = 10 ohm, and the power factor cos(phi) = R/Z = 6/10 = 0.6.
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