Physics (AS & A Level) · Oct / Nov 2024 · Paper 12 · Question 34
9702Electric current
An electric current of 12 A is in a wire of length 0.35 m. The average drift speed of the free electrons (charge carriers) in the wire is 5.0 × 10⁻⁴ m s⁻¹. How many free electrons are in the wire?
- A1.3 × 10¹⁶
- B5.3 × 10²²
- C1.5 × 10²³
- D4.3 × 10²³
As printed in the paper
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Correct answer: B. 5.3 × 10²²
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