Physics (AS & A Level) · Oct / Nov 2022 · Paper 11 · Question 31

A length of wire RS has a circular cross-section. At end R of the wire, the cross-sectional area is A. At end S of the wire, the cross-sectional area is A/2. Charge Q takes time t to pass through end R of the wire. There is a constant electric current in the wire. How much charge will pass through end S in a time interval of t/4?

1. AQ/8
2. BQ/4
3. CQ/2
4. DQ

As printed in the paper