Physics (AS & A Level) · May / June 2025 · Paper 51 · Question 1

Fig. 1.1 shows a thin coil of cross-sectional area A and length l connected to a resistor of resistance S and two terminals. S l Fig. 1.1 An alternating voltage is applied to the terminals. The peak value of the alternating voltage is E and the frequency is f. The peak value of the potential difference V across the resistor is determined using an oscilloscope. It is suggested that V is related to f by the relationship ES V = KAN 2f l where N is the number of turns on the coil and K is a constant. Plan a laboratory experiment to test the relationship between V and f. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine a value for K. 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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