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Physics (AS & A Level) · May / June 2018 · Paper 11 · Question 32

9702Resistance and resistivity

A cylindrical piece of a soft, electrically-conducting material has resistance R. It is rolled out so that its length is doubled but its volume stays constant. What is its new resistance?

  1. AR/2
  2. BR
  3. C2R
  4. D4R

As printed in the paper

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Correct answer: D. 4R

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