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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 layer of glycerine of thickness 1 mm present between a large surface area of 0.1 m².
- The kinetic energy needed to project a body of mass m from the surface of earth
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A layer of glycerine of thickness 1 mm present between a large surface area of 0.1 m².
- The kinetic energy needed to project a body of mass m from the surface of earth
- The intensity at the maximum in a Young’s double slit experiment is I₀.
- The core of a transformer is laminated because
- A stone thrown into still water, creates a circular wave pattern moving radially
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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