| ⇦ | 
| ⇨ |
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 magnetic field at a point on the axis of a long solenoid having 5 turns per cm
- Electron in hydrogen atom first jumps from third excited state to second excited
- An electric dipole of moment ‘p’ is placed in an elecatric field of intensity ‘E’
- Two balls of mass m₁ and m₂ are separated from each other by powder charge
- A block of mass 0.50 kg is moving with a speed of 2.00 ms⁻¹ on a smooth surface.
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The magnetic field at a point on the axis of a long solenoid having 5 turns per cm
- Electron in hydrogen atom first jumps from third excited state to second excited
- An electric dipole of moment ‘p’ is placed in an elecatric field of intensity ‘E’
- Two balls of mass m₁ and m₂ are separated from each other by powder charge
- A block of mass 0.50 kg is moving with a speed of 2.00 ms⁻¹ on a smooth surface.
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply