Two charges - q and +q are located at points a(0,0,-a
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Two charges +q and -q are located at points A [0,0,-a] and B [0,0,+a] respectively. ... Hence to move the test charge from P to Q the amount of work to be done is zero. This can be seen from figure. Points A and B are on z-axis and they are equi-distant points from y-axis.
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