| ⇦ | 
| ⇨ |
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: - Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
- If A.B=A x B,then the angle between A and B is
- Across a metallic conductor of non-uniform cross-section, a constant potential
- A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor.
- In the given (V – T) diagram, what is the relation between pressure P₁ and P₂?
Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two similar springs P and Q have spring constants Kp and Kq, such that Kp>Kq.
- If A.B=A x B,then the angle between A and B is
- Across a metallic conductor of non-uniform cross-section, a constant potential
- A battery of emf 10 V and internal resistance 3 ohm is connected to a resistor.
- In the given (V – T) diagram, what is the relation between pressure P₁ and P₂?
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