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4. The centre of mass is defined as Ri Σ mi ri, supposewe define "centre of charge" as Rc 1 Σ qiri where qirepresents the ith charge placed at ri and Q is the totalcharge of the system.(a) Can the centre of charge of a two-charge system beoutside the line segment joining the charges?(b) If all the charges of a system are in X-Y plane, is itnecessary that the centre of charge be in X-Y plane?(c) If all the charges of a system lie in a cube, is itecessary that the centre of charge be in the cube ?

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