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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: - The total energy of a particle executing SHM is 80 J
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The total energy of a particle executing SHM is 80 J
- Two bulbs 60 W and 100 W designed for voltage 220 V are connected in series
- In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
- An inclined plane of length 5.60m making an angle of 45⁰ with the horizontal is placed
- A condenser has a capacity 2 μF and is charged to a voltage of 50 V. The energy
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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