The electric field between two parallel plates is uniform, with magnitude 666 N/C. A proton is held stationary at the positive plate, and an electron is held stationary at the negative plate. The plate separation is 4.30 cm. At the same moment, both particles are released. (a) Calculate the distance (in cm) from the positive plate at which the two pass each other. Ignore the electrical attraction between the proton and electron. cm (b) Repeat part (a) for a sodium ion (Na+) and a chloride ion (CI). (Give your answer in cm.) 2.608 cm