A point dipole $\overrightarrow p = - {p_0}\widehat x$
is kept at the origin. The potential and electric field due to this dipole on the
y-axis at a distance d are, respectively: (Take V= 0 at infinity)
${{\left| {\overrightarrow p } \right|} \over {4\pi { \in _0}{d^2}}},{{ - \overrightarrow p } \over {4\pi { \in _0}{d^3}}}$
$0,{{\overrightarrow p } \over {4\pi { \in _0}{d^3}}}$
${{\left| {\overrightarrow p } \right|} \over {4\pi { \in _0}{d^2}}},{{\overrightarrow p } \over {4\pi { \in _0}{d^3}}}$
$0,{{ - \overrightarrow p } \over {4\pi { \in _0}{d^3}}}$
