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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: - A block of mass m is placed on a smooth wedge of inclination θ
- A scooter is going round a circular road of radius 100 m at a speed of 10m/s
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A block of mass m is placed on a smooth wedge of inclination θ
- A scooter is going round a circular road of radius 100 m at a speed of 10m/s
- A body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank
- Which is incorrect about thermal process
- Charge q is uniformly spread on a thin ring of radius R. The ring rotates
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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