In the figure what are the (a) magnitude and (b) direction of the net electrostatic force on particle 4 due to the other three particles? All four particles are fixed in the xy plane, and q1 = - 3.20 x 10-19 C, q2 = + 3.20 x 10-19 C, q3 = + 6.40 x 10-19C, q4 = + 3.20 x 10-19 C, θ1 = 30.0 degrees, d1 = 3.00 cm, and d2 = d3 = 2.00 cm.
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