An electron flies in between two horizontal parallel plates at a speed of 12000 km/s and at an angle 
with respect to the horizontal. The upper plate is negatively charged while the lower one is positively charged. What is the voltage between the plates if the electron exits at an angle 
. The length of the plates is 10 cm and the distance between them is 8 mm.
The charge of the electron is 
and the mass of the electron is 
.
