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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: - A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
- A neutron moving with velocity v collides with a stationary particle
- Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
- A neutron moving with velocity v collides with a stationary particle
- Electrons with energy 80 keV are incident on the tungsten target of an X-ray tube.
- X-rays when incident on a metal
- If a steel wire of length l and magnetic moment M is bent into a semicircular arc,
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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