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  4. An electric dipole when placed in a uniform electric field will have minimum potential energy,if the angle between dipole moment and electric field is

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Q. An electric dipole when placed in a uniform electric field will have minimum potential energy,if the angle between dipole moment and electric field is

Electrostatic Potential and Capacitance

Solution:

The potential energy of a dipole in an electric field is, $-\vec{p} \cdot \vec{E}$
The potential energy is thus minimum when $p$ and $E$ are in the same direction.