# What is the force between a charged point and a charged 3d-object?

If you have a sphere of radius $R$ with a uniformly distributed charge $Q$ on the surface and a point of charge $q$ with a distance to the center of the sphere on $d$, what would be the force experienced by the point charge? Would it be more correct to treat the sphere as a single point, using Coloumbs Law, or would it be more correct to use integrals to calculate the force from each 'point' on the sphere?