Please provide a correct, clear, and well explained solution for the following

electromagnetism subject/class

a)

a} Three charges are situated at the corners of a square [side a] How much work does it take to take the fourth charge, +q1 from far era-rag,r place and place it in the fourth corner?II b} How much work does it take to assemble the whole conguration of four charges? Two positive paint charges 43,; and 9-3 [masses 171,1 and mg} are at rest, held together by a massless string of length a. The string is then cut, and the particles fly off in oppnsite directinns. How fast is each one going, when the}.r are far apart