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The impedance of a circuit consists of $3 \mathrm{ohm}$ resistance and $4 \mathrm{ohm}$ reactance. The power factor of the circuit is
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The correct answer is:
0.6
$\begin{aligned} & Z=\sqrt{R^2+X^2}=\sqrt{4^2+3^2}=5 \\ & \therefore \cos \phi=\frac{R}{Z}=\frac{3}{5}=0.6\end{aligned}$
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