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$2q \cdot E$ and minimum
B$q \cdot E$ and $p \cdot E$
C
Zero and minimum
D$q \cdot E$ and maximum
AIPMT 2004, Easy
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C
Zero and minimum
c (c) In the given condition angle between $\vec p$ and $\vec E$ is zero. Hence potential energy $U = - \,pE\cos 0 = - \,pE\, = \min .$
Also in uniform electric field $F_{net} = 0$.
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