Navigate

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 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

KL2013
admin:

Related Questions

  1. If A=4i+4j+4k and b=3i+j+4k, then angle between vectors A and B is
  2. An ideal coil of 10 H is connected in series with a resistance of 5Ω and a battery
  3. Angle of contact of a liquid with a solid depends on
  4. 40 g of Argon is heated from 40⁰C to 100⁰C (R=2 cal/mole). Heat absorbed at constant
  5. When a ceiling fan is switched off its angular velocity reduces to 50% while