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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
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Sound waves travel at 350m/s through a warm air and at 3500 m/s through brass
- If emf induced in a coil is 2 V by changing the current in it from 8 A to 6 A
- To demonstrate the phenomenon of interference, we require two sources which emit
- A block of mass m1 rests on a horizontal table. A light string connected
- Vectors A⃗, B⃗ and C⃗ are such that A⃗ . B⃗ = 0 and A⃗ . C⃗ = 0 Then the vector parallel
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Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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