Electric field strength due to a dipole of moment p at a distant point r along the axis of the dipole is:
1
\(E=\dfrac{1}{2\pi\epsilon_0} \dfrac{p}{r^3}\)
2
\(E=\dfrac{1}{2\pi\epsilon_0} \dfrac{p^2}{r^3}\)
3
\(E=\dfrac{1}{2\pi\epsilon_0} \dfrac{p}{r^2}\)
4
\(E=\dfrac{1}{2\pi\epsilon_0} \dfrac{p}{r}\)