Two $2\mathrm{.}1-$cm$-$diameter$-$disks spaced $1\mathrm{.}6$ mm apart form a parallel$-$plate capacitor. The electric field between the disks is $4\mathrm{.}8105$ V$/$m $.$ What is the voltage across the capacitor? How much charge is on each disk? an electron is launched from the negative plate. it strikes the positive plate at a speed of $2\mathrm{.}2$x$10^7$ m$/$s$.$ what was the electron's speed as it left the negative space?