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Physics (AS & A Level) · Oct / Nov 2021 · Paper 13 · Question 35

9702Resistance and resistivity

A wire of uniform cross-section has resistance R. A second wire is made of the same material but is twice as long and has twice the diameter of the first wire. What is the resistance of the second wire?

  1. AR/8
  2. BR/2
  3. CR
  4. D8R

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Correct answer: B. R/2

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