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JEE Main 2002 (AIEEE) · Power, Power Factor & Wattless Current

Power, Power Factor & Wattless Current question from JEE Main 2002 (AIEEE)

Q80JEE Main 2002 · AIEEEEasy

Power, Power Factor & Wattless Current

The power factor of $AC$ circuit having resistance $(R)$ and inductance $(L)$ connected in series and an angular velocity $\omega$ is

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Answer: (b)

For series LR, $Z = \sqrt{R^2 + \omega^2L^2}$ .
Power factor $\cos\phi = \frac{R}{Z} = \frac{R}{(R^2 + \omega^2L^2)^{1/2}}$ .
So the answer is (b).

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