Part A

Two flat $4\mathrm{.}0$ cm $4\mathrm{.}0$ cm electrodes carrying equal but opposite charges are spaced $2\mathrm{.}0$ mm apart with their midpoints opposite each other. Between the electrodes but not near their edges, the electric field strength is $4\mathrm{.}6106$ N$/$C$.$ What is the magnitude of the charge on each electrode? $($ $0=8\mathrm{.}8510-12$ C$2/$N $$ m$2)$