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The potential differences across the res...

The potential differences across the resistance, capacitance and inductance are `80 V, 40 V` and `100 V` respectively in an `L-C-R` circuit. The power factor of this circuit is

A

0.4

B

0.5

C

0.8

D

1

Text Solution

Verified by Experts

The correct Answer is:
C
`cosphi=(V_(R))/(V_("net"))=(V_(R))/(sqrt((V_(L)-V_(C))^(2)+V_(R)^(2)))`
`=(80)/(sqrt((100-40)^(2)+80^(2)))=(80)/(100)=0.8`
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