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Physics (AS & A Level) · Feb / March 2022 · Paper 12 · Question 29

9702Electric current

For a current-carrying wire, the current can be calculated using the equation shown. I = Anvq What is the meaning of n?

  1. Athe number of charge carriers in the wire
  2. Bthe number of charge carriers multiplied by the volume of the wire
  3. Cthe number of charge carriers per unit length of the wire
  4. Dthe number of charge carriers per unit volume of the wire

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Correct answer: D. the number of charge carriers per unit volume of the wire

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