A negative charge is placed at some point on the line joining the two +Q charges at rest. The direction of motion of negative charge will depend upon the:
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A
According to coulomb's law 
In question it is mentioned that a negative charge is placed at some point on the line joining the two charges, therefore the force is given as
The above equation shows that the direction of motion of the negative charge will depend upon the position of the negative charge alone.
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