Physics 9702: ELECTRIC FIELDS Topical Past Paper Questions

(a) State Coulomb's law. [2] (b) In a model of an atom, an electron is in a circular orbit around a proton, as shown in Figure 1.1. Figure 1.1 The electric potential energy of the electron is $ -1.09 \times 10^{-18} $ J. (i) Show that the radius of the orbit is $ 2.11 \times 10^{…

(a) Explain why the electric potential near an isolated proton is positive. [3] (b) An isolated metal sphere is positively charged and has radius R, as shown in Fig. 5.1. Fig. 5.1 Line XY passes through the centre of the sphere. Point P lies on line XY at a variable displacement…

(a) State the relationship between electric field and electric potential. [2] (b) Two charged isolated insulating spheres X and Y are near to each other, as shown in Fig. 5.1. Fig. 5.1 P is a point on the line joining the centres of the spheres. Explain why it is not possible for…