3. Three charges are placed in locations shown in the diagram below. (a) What is the electric field (magnitude and direction) at point P? Answer the direction in terms of the angle relative to the positive side of the x-axis. (b) A negative charge of -30 nC is placed at point P. What is the electric force (magnitude and direction) on the -30 nC charge? Answer the direction in terms of the angle relative to the positive side of the x-axis. P +20 nC I m 30 30 +10 nC