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3 charges 4q.Q and q are in straight line in the position O,l/2 and l respectively.The resultsnt force on q will be
4q Q q
___________
0 0.5 1
Force on q = Qq/4*pi*e*(1/2)^2 + 4q^2/4*pi*e*(1)^2 (e=absolute permittivity of free space)
= 4q(q+Q)/4*pi*e (towards right)
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