Give the expression for the potential energy of a dipole in an external electric field with the help of a neat diagram.

Explanation

Potential energy `= - vec( p). vec(E )`
Note `:` `W = int_(theta_(0))^(theta) pE sin theta d theta = p E ( cos theta_(0) - cos theta ) `, put `theta_(0) = ( pi)/( 2)` to get P.E.