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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
- An inductor is connected to an a.c. source when compared to voltage,
- A string in musical instrument is 50 cm long and its fundamental frequency is 800 Hz.
- Length of a conductor is 50 cm radius of cross section 0.1 cm and resistivity
- A flywheel rotating about a fixed axis has a kinetic energy of 360 J when
- The temperature of a body falls from 50⁰C to 40⁰C in 10 minute. If the temperature
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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