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Physics (AS & A Level) · May / June 2024 · Paper 12 · Question 32

9702Electric current

A cylindrical wire has cross-sectional area A and number density of free electrons n. The wire has current I and the free electrons have average drift speed v. A second cylindrical wire has cross-sectional area 0.5A and number density of free electrons 2n. In this wire, the free electrons have average drift speed 2v. What is the current in the second wire?

  1. A0.5I
  2. BI
  3. C2I
  4. D4I

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Correct answer: C. 2I

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