What is the electric field due to a dipole on an equitorial plane

what is the electric field due to a dipole on an equitorial plane.

For an electric dipole consisting of two charges -q and +q seperated by a distance ‘2a’, the electric field intensity at a pont on the equitorial line of the dipole at a distance ‘r’ is given as
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If r >>a, then a2 can be neglected in comparision to r2. Then,
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