A) 1
B) \[\frac{1}{2}\]
C) zero
D) \[\frac{1}{\sqrt{2}}\]
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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