A-LevelPhysicsElectricity9702/12 · Feb/Mar 2017 · Q321 Mark

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

✓ 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

Oracle Prep sorts past-paper questions by topic, so you can drill Electricity and see which topics are most likely to come up next.

Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2017 Paper 1 Variant 2, question 32.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content