Three charged particles are at the corners of an equilateral triangle as shown in the figure below. (Let q = 3.00 JC, and L = 0.950 m.) 7.00 MC 60.0 X -4.00 JC (a) Calculate the electric field at the position of charge q due to the 7.00-JC and -4.00-HC charges. KN/Ci+ KN/C j (b) Use your answer to part (a) to determine the force on charge q. mN i+ mN j