Three point charges are placed on the x-axis. a charge of +2.0 μc is placed at the origin, -2.0 μc to the right at x = 50 cm, and +4.0 μc at the 100 cm mark. what are the magnitude and direction of the electrostatic force which acts on the charge at the origin?

- q1 = 6.0 nc is at (0.30 m, 0); q2 = -1.0 nc is at (0, 0.10 m); q3 = 5.0 nc is at (0, 0). what is the magnitude and direction of the net force on the 5.0 nc charge?

- a 5.0-c charge is 10 m from a small test charge. what is the magnitude and direction of the electric field at the location of the test charge?

- three 3.0 μc charges are at the three corners of a square of side 0.50 m. the last corner is occupied by a -3.0 μc charge. find the electric field at the center of the square.