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Aug 17, 2018 at 20:18 comment added Michael Seifert The fact that the net force on $Q$ from all the surface charges is zero doesn't imply that the force on $Q$ from any individual patch of the surface is zero. And if the force on $Q$ from some patch of the surface is non-zero, then the force on the charges in that patch from $Q$ will also be non-zero, and the charges on that path will move around in response to it.
Aug 17, 2018 at 20:14 comment added PhysMs Ok (and thanks), so if the electrons are stuck in a uniform distribution there is no force felt by charge Q. But if it is a conducting shell the electrons feel a force from the charge and move. How can the charge Q feel no force from the electrons in the shell (at the initial point before any redistribution, but the electrons in the shell feel a force from Q at this point to redistribute?
Aug 17, 2018 at 20:05 vote accept PhysMs
Aug 17, 2018 at 17:33 history answered Michael Seifert CC BY-SA 4.0