In the figure four particles form a square with edge length a = 4.20 x 102 m. The charges are q1-44-3.08 x 10-15 C and q-q-q (a) What is q if the net electrostatic force on particle 1 is zero? (b) Is there any value of a that makes the net electrostatic force on each of the four particles zero? a) Number b) Units
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