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A metal wire of circular cross-section has a resistance R₁. The wire is now stretched without breaking, so that its length is doubled and the density is assumed to remain the same. If the resistance of the wire now becomes R₂, then R₂:R₁ is
Options
(a) (1:1)
(b) (1:2)
(c) (4:1)
(d) (1:4)
Correct Answer:
(4:1)
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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Topics: Current Electricity
(136)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- When light of wavelength 300 nm falls on a photoelectric emitter,
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- A block slides from an inclination of 45°.If it takes time twice
- If a given volume of water in a 220V heater is boiled in 5 min, then same volume
- A long straight wire carries a certain current and produces a magnetic field
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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