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Physics (AS & A Level) · Oct / Nov 2022 · Paper 12 · Question 34

9702Resistance and resistivity

A metal wire has resistance R. The wire is stretched so that its diameter decreases to 94.0% of the original diameter. The volume of the wire is unchanged. What is the resistance of the stretched wire?

  1. A1.06R
  2. B1.13R
  3. C1.20R
  4. D1.28R

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Correct answer: D. 1.28R

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