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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 short bar magnet of magnetic moment 0.4 JT⁻¹ is placed in a uniform magnetic field
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
- A galvanometer having internal resistance 10Ω requires 0.01 A for a full scale
- Which of the following is the function of the step-up transformer?
- Photons of 5.5 eV energy fall on the surface of the metal emitting photoelectrons
Topics: Current Electricity (136)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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