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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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- Temperature is a measurement of coldness or hotness of an object.
- In a tangent galvanometer, a current of 0.1 A produces a deflection of 30⁰.
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A uniform chain of length L and mass m is kept on a smooth table. It is released
- Temperature is a measurement of coldness or hotness of an object.
- In a tangent galvanometer, a current of 0.1 A produces a deflection of 30⁰.
- The molecular weight of a gas is 44. The volume occupied by 2.2 g of this gas
- If an electron and a proton have the same de-Broglie wavelength, then the kinetic
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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