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Physics (AS & A Level) · May / June 2025 · Paper 12 · Question 32

9702Resistance and resistivity

A wire is made from a metal of constant resistivity. There is a constant current in the wire. Which statement about the potential difference across the wire is correct?

  1. AIt is directly proportional to the length of the wire.
  2. BIt is inversely proportional to the length of the wire.
  3. CIt is directly proportional to the diameter of the wire.
  4. DIt is inversely proportional to the diameter of the wire.

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Correct answer: A. It is directly proportional to the length of the wire.

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