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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 U²³⁵ reactor generates power at a rate of P producing 2×10⁸ fission per second.
- Three masses are placed on the x-axis : 300 g at origin, 500 g at x = 40 cm
- Two small spherical shells A and B are given positive charges of 9C and 4C
- At a metro station, a girl walks up a stationary escalator in time t₁
- An alternating voltage of 220 V, 50 Hz frequency is applied across a capacitor
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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