Question

Electric field intensity due to a short dipole remains directly proportional to - ( r → distance of a point from centre of dipole) a) r^2 b) r^3 c) r^-2 d) r^-3

Answer 1

The correct option is (d).

Explanation:

Th electric field intensity due to a short dipole is given by the formula as follows :

$E=\dfrac{1}{4\pi \epsilon_o}\dfrac{2P}{r^3}$

Here,

$\epsilon_o$ is relative permitivity

P is dipole moment

r is the distance from the center of dipole

So, the electric field intensity due to a short dipole remains directly proportional to $r^{-3}$. Hence, the correct option is (d)

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Electric field intensity due to a short dipole