Physics (AS & A Level) · Oct / Nov 2022 · Paper 52 · Question 1

A thin copper sheet is suspended from a small hole near the top of the sheet and placed in a magnetic field, as shown in Fig. 1.1. z area A direction of magnetic field copper sheet hole Fig. 1.1 (not to scale) The sheet has area A and thickness z. The sheet is displaced from its equilibrium position and then released so that it oscillates perpendicular to the direction of the magnetic field. The time t from when the sheet is released to when it becomes stationary is measured. It is suggested that t is related to z by the relationship t = Kz q ABρ where B is the magnetic flux density of the field, ρ is the density of copper, and K and q are constants. Plan a laboratory experiment to test the relationship between t and z. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine values for K 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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