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Two charges -q and +q are located at poi...

Two charges -q and +q are located at point A(0, 0, -a) and B(0, 0, +a) respectively. How much work is done in moving a test charge from point P(7, 0, 0 ) to Q(-3, 0, 0)?

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Every point on x axis is on equatorial line of electric dipole
`therefore` Potential on it is zero
`W = qDeltaV=0`
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