MENU

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. Two identical cells of the same e.m.f. and same internal resistance
  2. Two point objects of masses 1.5 g and 2.5 g respectively are at a distance of 16 cm
  3. The ionisation potential of hydrogen-atom is -13.6 eV. An electron in the groundstate
  4. Work of 3.0×10⁻⁴ joule is required to be done in increasing the size of a soap film
  5. A round uniform body of radius R, mass M and moment of inertia I rolls down

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Your email address will not be published.


*