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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
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A motor-cyclist drives a motor cycle in a vertical circle. His minimum velocity
- The ratio of the dimensions of planck’s constant and that of the moment of inertia is
- In stretching a spring by 2 cm, energy stored is given by U. Had is been stretched
- A capacitor of 10 µF charged upto 250 volt is connected in parallel with another
- In Young’s double slit experiment, the fringe width is 1×10⁻⁴ m, if the distance
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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