77 2.2 Two point charges of + 1x 10-4 and - 1 x 10-4 coul are placed at a distance of 40 cm from each other. A Charge + 6 x 10-5 coul is placed midway between them. What is the magnitude and direc- tion of force on it.
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F=kq1q/(0.5l) ^2+kq2q/(0.5l) ^2
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