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BITSAT 2014
Exam
BITSAT
Year
2014
Subject
Physics
Chapter
Current Electricity

BITSAT 2014 · Physics · Current Electricity

A wire X is half the diameter and half the length of a wire Y of...

A wire XX is half the diameter and half the length of a wire YY of similar material. The ratio of resistance of X\mathrm{X} to that of Y\mathrm{Y} is

Options

  1. A8: 1
  2. B4: 1
  3. C2: 1
  4. D1: 1

Correct answer

C. 2: 1

Step-by-step solution

R∝ℓD2⇒RxRy=21\mathrm{R} \propto \frac{\ell}{\mathrm{D}^{2}} \Rightarrow \frac{\mathrm{Rx}}{\mathrm{Ry}}=\frac{2}{1}
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