Conductors & Insulators
electric charges are free to move from place to place.
Therefore: Unless E=0 inside a conductor, electric charges will move around, except at the surface.
Electric charges are fixed in one place, can’t move.
Therefore: There are atomic-level forces that keep electrons in place, like in an atom.
Here is the difference between conductors and insulators from the point of view of electric field.
Electric fields do have some effect on insulators -- the atoms and molecules in insulators can be “polarized,” meaning that