Question

Intensity of an electric field $E$ due to a dipole, depends on distance $r$ as:

• A. $E\propto \frac{1}{r^{4}}$
• B. $ E\propto \frac{1}{r^{3}}$
• C. $ E\propto \frac{1}{r^{2}}$
• D. $ E\propto \frac{1}{r} $

Answer 1

Answer: (B)

Here: Electric field $=E$
Distance $=r$
The electric field intensity due to dipole is
$E=\frac{1}{4 \pi \varepsilon_{0}} \times \frac{2 p}{r^{3}} \propto \frac{1}{r^{3}}$