A-LevelPhysicsElectricity9702/12 · May/June 2019 · Q331 Mark

A length of wire is connected into a circuit. [Figure 33.1] The area of the cross-section of the wire changes from A at R to (1/4)A at S. There is a constant current in the wire. Charge Q passes R in time t. What is the charge passing point S in the same time t?

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A(1/4)Q

CQ√2

D2Q

✓ Correct answer

B: Q

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Topic: Electricity, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, May/June 2019 Paper 1 Variant 2, question 33.

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