Physics (AS & A Level) · Oct / Nov 2024 · Paper 51 · Question 1

A thin cylindrical bar magnet of length L and cross-sectional area A is attached to a block. An identical magnet is attached to a trolley, as shown in Fig. 1.1. N N L s D P block magnets trolley bench Fig. 1.1 The trolley is held so that the separation of the N poles of the two magnets is s. Point P is a distance D from the N pole of the magnet on the stationary trolley. The trolley is released. The speed v of the trolley at point P is determined using one light gate. It is suggested that v is related to s by the relationship D mv s KA B L Q 2 2 2 2 2 4 = - where B is the magnetic flux density at the N pole of one of the magnets, m is the mass of the trolley, and K and Q are constants. Plan a laboratory experiment to test the relationship between v and s. 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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