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Physics (AS & A Level) · Feb / March 2019 · Paper 12 · Question 32

9702Electric current

The electric current in a wire may be calculated using the equation I = Anvq. Which statement is not correct?

  1. An is the number of charge carriers per unit volume of the wire.
  2. BnA is the number of charge carriers per unit length of the wire.
  3. Cq is the charge of each charge carrier.
  4. Dv is the velocity of each charge carrier.

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Correct answer: D. v is the velocity of each charge carrier.

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