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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
Related Questions: - A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- If alternating source of primary coil on transformer is replaced by a Laclanche cell
- Two coils of self inductance 2 mH and 8 mH are placed so close together
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- If alternating source of primary coil on transformer is replaced by a Laclanche cell
- Two coils of self inductance 2 mH and 8 mH are placed so close together
- If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
- Which component of electromagnetic spectrum have maximum wavelength?
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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