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

admin:

Related Questions

  1. Volume of gas becomes four times if temperature becomes
  2. 64 drops of mercury, each charged to a potential of 10 V, are combined
  3. Two particles of masses m₁ m₂ move with initial velocities u₁ and u₂
  4. On the horizontal surface of a truck a block of mass 1 kg is placed (µ=0.6) and truck
  5. Mass of the nucleons together in a heavy nucleus is