Physics (AS & A Level) · May / June 2024 · Paper 52 · Question 1

A spring is attached to a strong cylindrical magnet of length L and cross-sectional area A. The magnet is placed on thin card on top of a magnetic sheet on the bench, as shown in Fig. 1.1. spring magnetic sheet bench cylindrical magnet card t Fig. 1.1 The thickness of the card is t. The magnetic flux density at one of the poles of the magnet is B. A force is applied upwards to the spring. The extension of the spring when the magnet just leaves the card is s. It is suggested that s is related to t by the relationship ks = ALBZ t where k is the spring constant of the spring and Z is a constant. Plan a laboratory experiment to test the relationship between s and t. Draw a diagram showing the arrangement of your equipment. Explain how the results could be used to determine a value for 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

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