Question

Two large conducting spheres carrying charges Q₁ and Q₂ are brought close to each other. Is the magnitude of the electrostatic force between them exactly given by Q₁ Q₂/4π∈₀r ², where r is the distance between their centres?

Answer 1

The force between two conducting spheres is not exactly given by the expression, Q₁ Q₂/4π∈₀r ², because there is a non-uniform charge distribution on the spheres.