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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 solid cylinder of mass 50kg and radius 0.5 m is, free to rotate about the horizontal axis
- If liquid level falls in a capillary then radius of capillary will be
- A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A solid cylinder of mass 50kg and radius 0.5 m is, free to rotate about the horizontal axis
- If liquid level falls in a capillary then radius of capillary will be
- A galvanometer has a coil of resistance 100 ohm and gives a full-scale deflection
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
- Eddy currents are used in
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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