posted by Scott .
Which is a vector quantity?
electric field intensity
electric field is a vector quantity. electric force is a vectory quantity.
A proton moves in a constant electric field E from point A to point B. The magnitude of the electric field is 6.4 × 104 N/C; and it is directed as shown in the drawing, the direction opposite to that of the proton. If the distance from point A to point B is 0.50 m, what is the change in the proton's electric potential energy, EPEA – EPEB?