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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 body of mass M hits normally a rigid wall with velocity V and bounces back
- To convert a 800 mV range millivoltmeter of resistance 40Ω into an ammeter of 100 mA
- When ultraviolet rays are incident on metal plate, then photoelectric effect
- In a radioactive decay process, the negatively charged emitted β- particles are
- A solid which is transparent to visible light and whose conductivity increases
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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