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Two point charges q and -q is placed at ...

Two point charges q and -q is placed at a distance 2a apart.Calculate the electric field at a point P situated at a distance r along the perpendicular bisector of the line joining the charges. What is the electric field when `r gtgt a` ? Also, give the direction of electric field W.r.t. electric dipole moment? .

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Direction of electric field is opposite to the direction of electric dipole moment.
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