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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: - In Moseley’s law √ν=a(z-b), the values of the screening constant for K-series
- If a solid ball of metal has a concentric spherical cavity with in it if the ball
- In the half wave rectifier circuit operating from 50 Hz mains frequency,
- Two point white dots are 1 mm apart on a black paper.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In Moseley’s law √ν=a(z-b), the values of the screening constant for K-series
- If a solid ball of metal has a concentric spherical cavity with in it if the ball
- In the half wave rectifier circuit operating from 50 Hz mains frequency,
- Two point white dots are 1 mm apart on a black paper.
- Charge q is uniformly spread on a thin ring of radius R. The ring rotates
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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