What is the maximum charge in Coulombs that can be stored in a copper wire? Lets say I have a thin copper wire (0.1 mm wide) that is 1 meter long. I'm asking about what could I practically achieve, not the theoretical maximum. For example how would I calculate the total charge of the wire after connecting it to a 100kV source, waiting a few seconds and then disconnecting it?
Would the largest charge in Coulombs be positive (by removing as many electrons from the wire as possible) or negative (by cramming as many extra electrons onto the wire as possible?
Additionally, if I wanted to build an object that would hold as much charge as possible for the least mass how would I do so? Would I use a conductor like copper or somehow statically charging an insulator? Would I use a long 1 dimensional shape like a wire, or a thin plate or a solid sphere or something else?
I have read some related questions How much electric charge can a copper sphere, made of N atoms, contain? and What limits the maximum sustainable surface charge density of a sphere in space? , but I am looking for what could be practically achieved, not a theoretical maximum. Even a rough order of magnitude estimation would be much appreciated.