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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
- The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
- If the r.m.s. velocity of a gas is v, then
- A cricket ball of mass 250 g collides with a bat with velocity 10 m/s
- In electromagnetic spectrum, the frequencies of γ-rays and x-rays and ultraviolet rays
- A parallel beam of fast moving electrons is incident normally on a narrow slit.
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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