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A wire of resistance 4 ohm is stretched to twice its original length. The resistance of stretched wire would be
Options
(a) 4Ω
(b) 8Ω
(c) 16Ω
(d) 2Ω
Correct Answer:
16Ω
Explanation:
Resistance R = ρℓ / A
ℓ’ = 2 ℓ ⇒ A’ = A / 2
R’ = ρ [2 ℓ / (A / 2)] = 4R = 4 × 4Ω = 16Ω
Related Questions: - Out of the following which pair of quantities does not have same dimensions?
- A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
- Two identical circular coils A and B are kept on a horizontal tube
- In n-type semiconductor, electrons are majority charge carriers
Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Out of the following which pair of quantities does not have same dimensions?
- A boat which has a speed of 5 kmh⁻¹ in still water crosses river of width 1 km long
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed
- Two identical circular coils A and B are kept on a horizontal tube
- In n-type semiconductor, electrons are majority charge carriers
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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