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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 small oil drop of mass 10⁻⁶kg is hanging in at rest between two plates seperated
- A body is thrown with a velocity of 9.8 m/s making angle of 30° with the horizontal
- A capacitor of capacitance value 1 μF is charged to 30 V and the battery
- If vₑ is escape velocity and vₙ is orbital velocity of a satellite
- Suppose for some reasons, radius of earth were to shrink by 1% of present value,
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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