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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 proton and an alpha particle both enter a region of uniform magnetic field B,
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A proton and an alpha particle both enter a region of uniform magnetic field B,
- A particle free to move along X-axis has potential energy given as U(X) =k(1-e⁻ˣ²)
- Which of the following statements is correct?
- When the wave of hydrogen atom comes from infinity into the first orbit,
- A wire mesh consisting of very small squares is viewed at a distance
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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