OnlineCBT
Physics · Electrostatic Potential
हिन्दीAn electric dipole consists of two charges \( q \) and \( -q \) separated by a small distance \( 2a \). The dipole moment is \( p = q \times 2a \text{ \hat{p}} \). At a point far away from the dipole (\( r \gg a \)), the electrostatic potential \( V \) varies with distance \( r \) as:
Correct answer · Option 3
\( V \propto \frac{1}{r^2} \)
Explanation
The potential due to a point charge falls off as \( 1/r \), whereas for a dipole, the leading term falls off as \( 1/r^2 \) (\( V = \frac{p \cos\theta}{4\pi\varepsilon_0 r^2} \)).
