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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 marble block of mass 2 kg lying on ice when given a velocity of 6 m/s is stopped
- At a given temperature the root mean square velocities of oxygen and hydrogen
- A thermocouple of negligible resistance produces an e.m.f. of 40 µV/⁰C in the linear range
- In atom bomb, the reaction which occurs is
- A stone of mass 1kg is tied to a string 4m long and is rotated at constant speed
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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