Physics (AS & A Level) · May / June 2019 · Paper 12 · Question 33

A length of wire is connected into a circuit. The area of the cross-section of the wire changes from A at R to 1/2 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?

1. A1/2 Q
2. BQ
3. CQ√2
4. D2Q

As printed in the paper