The electric field of a dipole at a point on the axis is _____________, where 'p' is the dipole moment and 'r' is the distance of the point from the centre of the dipole and assuming (r >> a) and where '2a' is the distance between the two charges.

• A. p/(4πεor3)
• B. 2p/(4πεor2)
• C. p/(4πεor2)
• D. 2p/(4πεor3)