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Three charged particles are placed on a ...

Three charged particles are placed on a straight line as shown in fig. `q_(1)` and `q_(2)` are fixed but `q_(3)` can be moved. Under the action of the forces from `q_(1),q_(2)` and `q_(3)` is in equilibrium. What is the relation between `q_(1)` and `q_(2)`.

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