May/June 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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31Current Potential DifferenceHard1 mark
The diagram shows a metal block.
a rectangular metal block (cuboid) with sides of length a, b and c labelled on its edges; current I enters at one end and leaves at the other, shown by arrows labelled I at each end
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?