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In figure, two positive charges q_2 and q_3 fixed along the y-axis, exert a net electric force in the + x direction on a charge q_(1)fixed along the x-axis. If a positive charge Q is added at (x, 0), the force on q_(1) |
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Answer» shall increase along the positive x-axis.  It means, `q_2` and `q_3` apply attractive force on `q_(1)` Hence, it can be said that QX is negative and `q_2` and `q_3` are positive. Now, if + Q charge is PLACED at (x, 0) then ATTRACTION force on negative charge ql will be in + x-axis. Hence, net force will be in + x-axis. 
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