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If a hollow sphere was uniformly filled
with charge, it would make a field similar to that shown here. The electric field would press the charges
outward. If the sphere was an
insulator, the charges could not move, but if the sphere was a conductor, the
charges would quickly flow outward.
After the charges have relaxed fully,
they will all be pressed against the outer radii of the sphere. The field inside the sphere will be
zero. More generally, there will be no
field inside for any conducting surface, no matter what its shape.