A horizontal beam of electrons initially moving at 4.2 107 m/s is deflected vertically by the vertical electric field between oppositely charged parallel plates as shown in the diagram. The magnitude of the field is 1.90 104 N/C.
(a) What is the direction of the field between the plates?
up
down
right
left
(b) What is the charge per unit area on the plates?
C/m2
(c) What is the vertical deflection d of the electrons as they leave the plates?
mm