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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: - Laser beams are used to measure long distance because
- A wire elongates by l mm when a load W is hanged from it. If the wire goes over
- When a mass M is attached to the spring of force constant k,
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Laser beams are used to measure long distance because
- A wire elongates by l mm when a load W is hanged from it. If the wire goes over
- When a mass M is attached to the spring of force constant k,
- A parallel plate condenser with a dielectric of dielectric constant K between the plates
- Six molecules have speeds 2 units, 5 units, 3 units, 6 units, 3 units and 5 units
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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