At great distances from an electric dipole, the electric field strength due to the dipole varies with the distance as

Step-by-step solution

For a dipole of length 2 l E= 1 4 ₀ K 2 p r (r^2-l^2 )^2 When (l r) , then l^2 may be neglected in comparison to r^2 . array cc & E= 1 4 ₀ K 2 p r r^4 & 1 4 ₀ K 2 p r^3 ~N / C & E 1 r^3 array