Question

The electric potential at a point on the axis of an electric dipole depends on the distance $r$ of the point from the dipole as

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

Answer 1

Answer: (B)

$\frac{1}{r^2}$

The expression of electric potential for dipole is , $V=\frac{1}{4\pi {ϵ}_0}\frac{p\cos \theta }{r^2}$ where $p=qd$ dipole moment.

so,$V\propto \frac{1}{r^2}$

Ans:(B)