If both the resistance and the inductance in an LR AC series circuit are doubled

If Both The Resistance And The Inductance In An Lr Physics Question

If both the resistance and the inductance in an LR AC series circuit are doubled the new impedance will be

Options

(a) halved
(b) fourfold
(c) doubled
(d) quadrupled

Correct Answer:

doubled

Explanation:

For L-R circuit, Z = √(R² + Xʟ²)

Z₁ = √(R₁² + Xʟ₂²)

Z₂ = √(R₂² + Xʟ₂²)

Given, R₂ = 2R and Xʟ₂ = 2Xʟ

Then, Z₂ = √[(2R)² + (2Xʟ)²] = 2 Z₁

Related Questions:

  1. The radius of orbit of a planet is two times that of the earth. The time period
  2. Two capacitors of capacitances 2 μF and 3 μF are joined in series.
  3. If a full wave rectifier circuit is operating from 50 Hz mains, the fundamental
  4. The excitation potential of hydrogen atom in the first excited state is
  5. “On flowing current in a conducting wire the magnetic field is produced around it”.

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Your email address will not be published.


*