Q.

If power factor is 1/2 in a series RL circuit R=100 Ω. ac mains is used then L is

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a

3π Henry

b

π Henry

c

π3 Henry

d

None of these

answer is A.

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Detailed Solution

cosφ=12⇒φ=60o    tan60o=ωLR⇒L=3πH
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