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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: - Two lines of force due to a bar magnet
- Ohm’s law is not applicable except to
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two lines of force due to a bar magnet
- Ohm’s law is not applicable except to
- Two concentric coils each of radius equal to 2π cm are placed at right angles
- The potential difference applied to an X-ray tube is 5 kV and the current through it
- Light emitted during the de excitation of electron from n=3 to n=2, when incident
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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