Physics (AS & A Level) · May / June 2026 · Paper 12 · Question 31
9702Electric current
The diagram shows a metal block. The block has sides of length a, b and c as shown, and its volume is V. Each charge carrier has a charge –q and the number density of the charge carriers in the metal is n. It takes each charge carrier an average time of t to pass through the block. What is an expression for the current I?
- AI = nqabc
- BI = \frac{nqV}{t}
- CI = \frac{nqbc}{t}
- DI = nqaV
As printed in the paper
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Correct answer: B. I = \frac{nqV}{t}
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