Question

The electric field of an electric dipole at a point on its axis, at a distance $d$ from the centre of the dipole, varies as

• A. $\frac{1}{d}$
• B. $\frac{1}{d^{2}}$
• C. $\frac{1}{d^{3}}$
• D. $\frac{1}{d^{\frac{3}{2}}}$

Answer 1

Answer: (C)

The electric field of an electric dipole at a point on its axis at a distance $d$ from the centre of the dipole is
$E=\frac{2 p}{4 \pi \epsilon _{0} d^{3}}$ , where $p$ is the dipole moment of the dipole.
Hence, $E \propto \frac{1}{d^{3}}$