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Physics · May / June 2020 · Paper 12 · Question 37

5054Resistance

A metal wire of length l and cross-sectional area A has resistance R. A second wire is made from the same metal. It has a length 2l and a cross-sectional area 4A. What is the resistance of the second wire?

  1. A8R
  2. B2R
  3. CR/2
  4. DR/8

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Correct answer: C. R/2

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