Some weeks ago I started an endeavour to (re)study physics on my own, I'm now focused on electrostatics where several examples of bodies with volumetrically distributed charges are given but I'm stuck with finding some example in the real world of such bodies.
Conductors for example behave in such a way that they redistribute the excess of charge on a thin layer right on the surface of the body thus behaving much like an empty shell with a charge distributed on the surface (is this correct?).
Now, can you give me some real example of charges distributed inside the volume of a body?
The only example that comes to my mind is the nucleus of the atom where the proton are distributed inside the nucleus toghether with the neutron.
Could you give me some "macro" example if any exist?