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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
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When temperature of an ideal gas is increased from 27⁰C to 227⁰C,
- Two forces of magnitude 8N and 15N respectively act at a point so as to make the resultant force
- A spring balance is attached to the ceiling of a lift.A man hangs his bag on the spring
- Ice is wrapped in black and white cloth. In which cases more ice will melt
- Two cities are 150 km apart. Electric power is sent from one city to another city
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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