In the figure four particles form a square with edge length a = 1.90 10^-2 m. The charges are q₁ = q₄ = 1.01 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?

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In the gure four particles form a square with edge length a = 1.90 x 10'2 m. The charges are q1 = q4 = 1.01 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? a) Number Units v b) v