how do you find the net force of three point charges on an x axis?

Tp24

New member
Three point charges are placed on the x-axis as follows: 20 uC at x = 0; 30uC at x = 0.50 m; and -12 uC at x = 1.2 m
Find the net force on the 20 uC point charge. Assume the direction of the x-axis as positive.
 
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