The correct formula for potential energy in the electric field of an electrical dipole body is, when the angle of the electric dipole is `theta` with the electric field `(k=(1)/( 4pi in_(0)))`

Options

A. `U=-pE cos theta`
B. `U=+pE cos theta`
C. `U=-pE cos theta+(kq^(2))/(2l)`
D. `U=-pE cos theta - (kq^(2))/(2l)`

Answer

D

Explanation

`U=U_(1)+U_(2)=-p E cos theta+(k(q)(-q))/(2l)`
`=-p E cos theta -(k q^(2))/(2l)`