Question

define electric dipole moment derive an expression for electric field intensity on axial line of dipole​

Answer 1

Answer:

Goal: To find electric field at point P on the axial line of the dipole, OP=r. Let E1 and E2 be electric field on P due to charges +q and −q respectively. E1=(r−a)2kq along AP. E2=(r+a)2kq along BP. The resultant electric field at P, E=E1−E2 (as both E1 and E2 are in opposite direction)

Explanation:

this is your right answer