4. An electron is placed at the negative plate of a capacitor which has an electric potential difference of 12 V. Determine the kinetic energy gained by the electron, in electron volts, if the electron is released and moves a) the entire distance through the capacitor. b) one third of the distance through the capacitor. 5. An alpha particle is placed at the negative plate of a capacitor which as an electric potential difference of 12 V. Determine the energy, in electron volts, required to move the alpha particle through the entire distance of the capacitor