- #1
mathnerd15
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say you have spherical metal conductor with a cavity with a positive charge inside, the field inside the cavity isn't zero and will induce an opposite charge/field on the surface of the cavity which will cancel the charge inside and lead to a zero Electric field inside the conductor. the negative charge on the wall/surface of the cavity (?) will in turn induce charges which move to the surface of the cylinder in uniform configuration. so this E field points normally outward though the E field inside the conductor is zero and information about the cavity is hidden from the outside because the E field is zero inside and the cavity charge induces an equal opposite charge on the cavity surface/walls
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