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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
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A man weighing 60 kg climbs a staircase carrying a 20 kg load on his hand
- In a primary coil 5 A current is flowing on 220 V. In the secondary coil 2200 V
- The displacement of a particle varies according to the relation x=4 (cos π t + sin π t)
- The angle of incidence at which reflected light is totally polarised for refraction
- In an unbiased p-n junction, holes diffuse from the p-region to n-region because of
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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