An electric dipole is placed at a distance of 2 cm from an infinite plane sheet having positive charge density $$\sigma_{0}$$.

Choose the correct option from the following.

Field due to infinite positive sheet is uniform and directed away from sheet.

Dipole moment is from −q to +q, which here is also away from sheet, so

$$⃗\vec{p}\parallel\vec{E}$$

Torque on dipole:

$$\tau=pE\sin\theta$$

Here

$$\theta=0$$

so

$$τ=0$$

Potential energy:

U=−p​⋅E=−pEcosθ

$$U=-pE$$

which is minimum.

Also forces on +q and −q are equal and opposite, so net force is zero.

Hence correct statement:

Potential energy is minimum and torque is zero.