Question

1. A point charge q1 = -7.o µC is at the point x = - 0.400 m, y = - 0.300 m and a second point charge q2 = - 3.0 µC is at the post x = - 0.400 m, y = 0 m. Calculate the magnitude and direction of the net electric force exerted by q1 and q2 on the third charge, q3 = - 4.0 nC located at the origin.

2. In problem #1, find the total electric field at the origin.