Please help me this question
In Fig. P1.3, q1 = 10e, q2 = -20e, q3 = -10e, q4 = 20e, where e = 1.602 x 10-19 C, r = 0.1mm. What is the magnitude and direction electrostatic force on each charge ?
This is fig p.1.3 :
http://i1376.photobucket.com/albums/ah26/john1x96/2_zps428cp3go.jpg
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