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

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) 2q⋅ E and minimum (B) q ⋅ E and p⋅ E (C) zero and minimum (D) q⋅ E and maximum

Tardigrade Admin · Accepted Answer

The total force on dipole is zero because F = q E is applied on each charge but in opposite direction. The potential energy is U = - p ⋅ E which is minimum when p and E are parallel.

Q. 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

$2 q \cdot E$ and minimum

$q \cdot E$ and $p \cdot E$

zero and minimum

$q \cdot E$ and maximum

The total force on dipole is zero because F = q E is applied on each charge but in opposite direction. The potential energy is U = $- p \cdot E$ which is minimum when $p$ and $E$ are parallel.

Q. 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

2q⋅E and minimum

q⋅E and p⋅E