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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 body is moving with velocity 30 m/s towards east. After 10 seconds its velocity
- A glass flask weighing 390 g having internal volume 500 cc just floats
- The Kα X-ray of molybdenum has a wavelength of 71×10⁻¹² m. If the energy of a molybdenum
- The young’s modulus of steel is twice that of brass. Two wires of same length
- The periodic waves of intensities I₁ and I₂ pass through a region at the same time
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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