9702/52/M/J/22: 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. 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
\(\dfrac{e}{I} = \dfrac{2PL}{A} + \dfrac{Qx}{y^2} \)
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.
Sample work sheet for planning before actually writing the solutions on the lines:
Sample solutions for practical Paper 5 variant 2 Question 1 May/June 2022 Cambridge A Level Physics.
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