In the figure four particles form a square with edge length a = 1.78 × 10-2 m. The charges are q1 = q4 = 3.23 x 10-15 C and q2 = q3 = 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? %3D a 12 3 4

In the figure four particles form a square with edge length a = 1.78 × 10-2 m. The charges are q1 = q4 = 3.23 x 10-15 C and q2 = q3 = 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? %3D a 12 3 4