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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
- A 1m long wire of diameter 0.31 mm has a resistance of 4.2Ω. If it is replaced by
- The value of coefficient of volume expansion of glycerin is 5 x 10⁻⁴ k⁻¹.
- Electric field at a point of distance r from a uniformly charged wire of infinite
- When a spring is extended by 2 cm energy stored is 100 J. When extended further by 2 cm
- A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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