Physics (AS & A Level) · Feb / March 2017 · Paper 12 · Question 32
9702Electric current
An electric current I is given in the list of formulae on page 3 as I = Anvq. What do each of the symbols represent for an electric current in a metal wire?
- AA: area of cross-section; n: number of free electrons; v: voltage; q: charge of each molecule
- BA: area of cross-section; n: number of free electrons per unit volume; v: average drift speed of electrons; q: charge of each electron
- CA: current; n: number of free electrons; v: average drift speed of electrons; q: charge of each molecule
- DA: current; n: number of free electrons per unit volume; v: voltage; q: charge of each electron
As printed in the paper
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Correct answer: B. A: area of cross-section; n: number of free electrons per unit volume; v: average drift speed of electrons; q: charge of each electron
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