If in a L-R series circuit the power factor is 1/2 and R=100Ω, then the value of L is,

If In A Lr Series Circuit The Power Factor Is Physics Question

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:

  1. A particle moving in a straight line with uniform acceleration is observed
  2. Rutherford’s ∝ particle experiment showed that the atoms have
  3. A wire having resistance 12Ω is bent in the form of an equilateral triangle.
  4. For a given velocity, a projectile has the same range R for two angles of projection.
  5. The magnifying power of a convex lens of focal length 10 cm, when the image

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.

NEETLab Mobile App

Share this page with your friends

Be the first to comment

Leave a Reply

Your email address will not be published.


*