An electric dipole has the magnitude of its charge as `q` and its dipole moment is `p`. It is placed in a uniform electric field `E`. If its dipole moment is along the direction of the field, the force on it and its potential energy are respectively

Options

A. `2q.E` and minimum
B. `q.E` and `p.E`
C. Zero and minimum
D. `q.E` and maximum

Answer

C

Explanation

In the given condition angle between `vecp` and `vecE` is zero.
Hence potential energy `U = - pE cos 0 = - pE = min`.
Also in unifrom electric field `F_(net) = 0`.