Question 1:(10pts) A three charge system is given below where qu = 1.5 C, 92= 2.5uC, 4z= 3.5uC, and d = 2 mm. (a) What is the magnitude and direction (to right or to left) of the electrostatic force on charge 42? (b) How much work must be done by an external agent to construct this three-point charge system when all charges are initially at infinity? d d 91 42 q3