1. The problem statement, all variables and given/known data Charge +q is distributed uniformley throughout a sphere of radius a. Show that the electric field a distance r from the centre of the sphere is as follows for r less than a E = qr/(4*pi*epsilon0*a^3) for r greater than E it is the standard equation of and E field around a point charge. 2. Relevant equations 3. The attempt at a solution Drawing a gaussian surface inside the sphere I have proved the first part of the question, for the second part my reasoning is as such, as the charge is distributed uniformley througout the sphere, this results in a constant E field through the sphere, but by gauss's law this means that the charge must form on the surface, thus the sphere can be treated as a point charge which results in the same equation for a point charge as required....is this correct? If not how would I go about the problem?