(Solved): 3. Three charges as shown in the picture. a) Calculate the electric force (magnitude and direction) ...

3. Three charges as shown in the picture. a) Calculate the electric force (magnitude and direction) at point p. b) Use part a to calculate the electric potential at point p. c) How much work is needed to bring a forth charge +Q and place it at point P. d) How much energy is needed to assemble the configuration of 3 charges? a +20 a XP +Q