Physics (AS & A Level) · Feb / March 2025 · Paper 52 · Question 1

Fig. 1.1 shows two identical cylindrical metal conductors P and Q, each of length L and cross‑sectional area A. L X Q P q p Fig. 1.1 The conductors are placed parallel to each other. The perpendicular distance from the midpoint of P to point X is p. The perpendicular distance from the midpoint of Q to point X is q. The two conductors are electrically connected in parallel. This parallel combination is connected in series to a power supply and a resistor. The potential difference V between the ends of P is the same as the potential difference between the ends of Q. The magnetic flux density at X due to the currents in the conductors is B. It is suggested that B is related to p by the relationship B = YAV Lp + YZAV Lq where Y and Z are constants. Plan a laboratory experiment to test the relationship between B and p. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine values for Y and Z. 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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