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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: - An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
- A charged particle with a velocity 2×10³ ms⁻¹ passes undeflected through electric field
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Topics: Alternating Current
(96)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An engine is moving towards a wall with a velocity 50 ms⁻¹ emits a note of 1.2 kHz.
- A charged particle with a velocity 2×10³ ms⁻¹ passes undeflected through electric field
- The magnetic field due to a current carrying circular loop of radius 3 cm at a point
- A parallel beam of fast moving electrons is incident normally on a narrow slit.
- A body of mass m slides down an incline and reaches the bottom
Topics: Alternating Current (96)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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