Force on what ?
do you mean in a row, each 20 cm from the previous ?
In general F = k Q1 Q2/d^2
toward each other if opposite sign
repel each other if same sign
Three point charge are located at a line 20cm with charge q1= -3uC, q2= +4uC, q3= -7uC. Determine the magnitude of the force.
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