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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 force of 10 newton acts on a body of mass 20 kg for 10 seconds. Change in its momentum
- The input resistance of a silicon transistor is 100 W. Base current is changed
- A satellite is launched into a circular orbit of radius R around earth while
- ₉₂U²³⁴ has 92 protons and 238 nucleons. It decays by emitting an alpha particle
- If ∆Q>0 when heat flows into a system, ∆W>0 when work is done on the system
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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