Physics (AS & A Level) · May / June 2022 · Paper 52 · Question 1

Two parallel cylindrical conductors each have a small cross‑sectional area A. A thin metal bar connects the two conductors, as shown in Fig. 1.1. L C C cylindrical conductors metal bar area A area A x y Fig. 1.1 (not to scale) The metal bar has a square cross‑section with sides of length y. For each conductor, the distance between its end C and the centre of the metal bar is L. The distance between the centres of the conductors is x. The ends C are connected to a power supply and the current I in the conductors is measured. It is suggested that I is related to L by the relationship E I = 2PL A + Qx y 2 where E is the electromotive force (e.m.f.) of the power supply, and P and Q are constants. Plan a laboratory experiment to test the relationship between I and L. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine values for P and Q. In your plan you should include: ● the procedure to be followed ● the measurements to be taken ● the control of variables ● the analysis of the data ● any safety precautions to be taken. 3 Diagram 4 [15]

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