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Three point charges Q(1), Q(2), Q(3) i...

Three point charges ` Q_(1), Q_(2), Q_(3)` in the order are placed equally spaced along a straight line. `Q_(2)` and` Q_(3)` are equal in magnitude but opposite in sign. If the net force on `Q_(3)` is zero. The value of `Q_(1)` is

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Force on `Q_(3)` due to `Q_(2)+` Force on `Q_(3)` due to `Q_(1)=0`
`1/(4 pi epsilon_(0))((-Q^(2))/(a^(2)))+1/(4 pi epsilon_(0))(Q_(1)Q)/(4a^(2))=0impliesQ_(1)=4Q_(3)`
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