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Question: Answered & Verified by Expert
Calculate the power factor of the circuit shown in figure

PhysicsAlternating CurrentNEET
Options:
  • A 0.2
  • B 0.4
  • C 0.8
  • D 0.6
Solution:
2728 Upvotes Verified Answer
The correct answer is: 0.8

Resistance of the circuit,

R=R1+R2=40 Ω+40 Ω=80 Ω

Impedance of the circuit,

Z=R2+XL-XC2=802+100-402

=802+602=100 Ω

Power factor, cosϕ=RZ=80100=0.8 

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