Question

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 –

• A. 2qE and minimum
• B. Qe and pE
• C. Zero and minimum
• D. Qe and maximum

Answer 1

Answer: (C)

Zero and minimum

Answer 2

In uniform electric field, and

U = – PE cos q = – PE cos 0⁰

= – PE (minimum)