Physics (AS & A Level) · May / June 2020 · Paper 42 · Question 7

A metal sphere of radius R is isolated in space. Point P is a distance x from the centre of the sphere, as illustrated in Fig. 7.1. x R P Fig. 7.1 The variation with distance x of the electric field strength E due to the charge on the sphere is shown in Fig. 7.2. 0 5 10 15 E / 105 V m–1 x / cm 20 2 0 4 6 8 10 12 Fig. 7.2

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