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If in a L-R series circuit the power factor is 1/2 and R=100Ω, then the value of L is, when AC mains is used
Options
(a) πH
(b) √3/π H
(c) π/√3 H
(d) √2/π H
Correct Answer:
√3/π H
Explanation:
power factor, cos ɸ = 1 / 2 ⇒ ɸ = 60°
Therefore, tan 60° = ωL / R ⇒ √3 = (2πv × L) / 100
L = [(√3 × 100) / (2π × 50)] = (√3 / π) H
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Topics: Alternating Current
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When a current of (2.5±0.5) A flows through a wire, it develops a potential difference
- A particle is moving such that its position coordinates (x,y) are (2 m,3 m) at time
- A total charge of 5µC is distributed uniformly on the surface of the thin walled
- A disc of radius 0.1 m is rotating with a frequency 10 rev/sec in a normal magnetic
- A rocket is fired upward from the earth surface such that it creates an acceleration
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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