6. A point charge of +q is placed 12 cm to the left of a point charge of 4q, as in Figure. Determine the location where a third charge will experience no force. q -4q 0 12 cm O 8. An electron with a velocity of 3.00x10 m/s (horizontally) passes through two horizontal parallel plates. The amplitude of the electric field between the plates is 150 N/C. The plates are 6.0 cm across. Edge effects in the field are negligible. (a) Calculate the vertical deflection of the electron. (b) Calculate the vertical component of the final velocity. (c) Calculate the angle at which the electron emerges