If power factor is \( \frac{1}{2} \) in a series \( R L \) circuit....

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If power factor is \( \frac{1}{2} \) in a series \( R L \) circuit. \( R=100 \Omega \),
\( \mathrm{P} \)
W then \( L \) is \( (f=50 \mathrm{~Hz}) \) :
(1) \( \pi H \)
(2) \( \frac{\sqrt{3}}{\pi} H \)
(3) \( \frac{\pi}{\sqrt{3}} H \)
(4) \( 2 \pi H \)
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