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The power factor of an AC circuit having resistance R and inductance L connected in series to an AC source of angular frequency ω is
Options
(a) zero
(b) ωL/R
(c) R/√R²+ω²L²
(d) R/ωL
Correct Answer:
R/√R²+ω²L²
Explanation:
power factor, cos ɸ = R / Z = R / √[R² +ω²L²]
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If ∆U and ∆W represent the increase in internal energy and work done by the system
- A round uniform body of radius R, mass M and moment of inertia I rolls down
- A light whose frequency is equal to 6.0 x 10¹⁴ Hz is incident on a metal
- A dip needle vibrates in a vertical plane perpendicular to magnetic meridian. The time
- Hard X-rays for the study of fractures in bones should have a minimum wavelength
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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