Question

please give me the right and simple explanation​

Answer 1

Answer:

$\\\tt \dfrac{1}{R^4}$

Explanation:

Potential energy of a dipole varies as $\\\tt \dfrac{1}{R^3}$

Since Work (Energy) is given by F.dR

$\\\tt \implies F= \dfrac{W}{dR}$

(dR represents change in distance)

The Force must vary as a factor of $\\\tt \dfrac{1}{R^4}$

Hence option (4),

Answer 2

Answer:

• 2nd opinion is correct
• for 1/(R)2
• radius is twice