Electric field intensity at a point varies as `r^(-3)` for

Options

A. A point charge
B. An electric dipole
C. A plane infinite sheet of charge
D. A line charge of infinite length

Explanation

To solve the question regarding how the electric field intensity varies with distance \( r \), we will analyze the different scenarios provided in the video transcript step by step.

### Step 1: Understanding the Variation of Electric Field Intensity
The problem states that the electric field intensity \( E \) varies as \( r^{-3} \). This means:
\[ E \propto \frac{1}{r^3} \]