4. A positive test charge of 1 p0 is 5. Two point charges are placed on the y-axis. placed halfway between a charge of +7 p0 and a charge of +5 pC that are 35 cm apart. Find the magnitude and direction of the net force on the test charge. Answer: One is +3.0 p0 and located at position (0, 2 m), the other is -2.0 p0 and located at the origin. Find the magnitude and direction of (a) the net electric field at (1.0 m, 0) and (b) the net force at (2.0 m, 0) on a 1.0 nC positive test charge. Answer: a. b