A) \[1\]
B) \[1/2\]
C) zero
D) \[1/\sqrt{2}\]
Correct Answer: A
Solution :
Power factor of L-C-R circuit \[\cos \,\phi =\frac{R}{Z}\] where Z is total impedence of circuit in resonance Z = R \[\therefore \]\[\cos \,\phi =\frac{R}{R}=1\] Power factor = 1
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