Three charges lie along the x - axis as in figure. The positive charge q1 = 9 μC is at x = 3 m, and the positive charge q2 = 25 μC is at the origin.
Where must a charge q3 be placed on the x - axis so that the resultant electric force on it is zero?
Gives
Equilibrium condition
8x=15
=1.875m
So third charge Put x'=1.875m
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