Electric Field - example
The Electric Field can be found two different ways.
1. Since we know the electric force and the charge at the field point, we can use: F = qE, or
Eat 1 = F/q1 = 2.76 x 1013 Nt / 3 C = 9.18 x 1012 Nt/C.
Since the charge at the field point is positive, the force and field point in the same direction.
2. Since we are dealing with the field due to a point charge (the -5 C charge), we can use:
Eat 1 = kq/r2 = (9x109Nt-m2/C2) * (5 C) / (.07m)2 =
9.18 x 1012 Nt/C; since the charge causing the field is negative, the field points towards the charge.