Steps and explanations please and thank you. B is a yes or no question.

In the figure four particles form a square with edge length a = 4.21 x 10-2 m. The charges are q1 = q4 = 1.29 x 10-15 C and q2 = 93 = q. (a) What is q if the net electrostatic force on particle 1 is zero? (b) Is there any value of q that makes the net electrostatic force on each of the four particles zero? 12 a 3 4 a) Number Units b)