In Fig.1.1, two positive charges q2 and q3 fixed along the y axis,exert a net electric force in the + x direction on a charge q1 fixed along the x axis. If a positive charge Q is added at (x, 0),the force on q1
Since positive charge q2? and q3? exert a net force in the +X direction on the charge Q1? fixed along the X-axis, the charge q1? is negative as shown in figure. Obviously, due to addition of positive charge Q ad (x,0) the force on −q shall increase along the positive X-axis.
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