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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
- Before using the tangent galvanometer, its coil is set in
- The r.m.s speed of the molecules of a gas in a vessel is 400 m/s
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
- If two electric bulbs have 40 W and 60 W ratings at 220 V, then the ratio
- The work function of metals is in the range of 2 eV to 5 eV.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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