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Physics (AS & A Level) · May / June 2019 · Paper 13 · Question 33

9702Resistance and resistivity

The graph shows the variation with length of the resistance of a uniform metal wire. The gradient of the graph is G. The wire has cross-sectional area A. Which expression could be used to calculate the resistivity of the metal of the wire?

  1. AG × A
  2. BG / A
  3. CA / G
  4. DG × A²

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Correct answer: A. G × A

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