When does the torque acting on an electric di | vedclass

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Question

(A) The torque $\vec{	au}$ acting on an electric dipole of dipole moment $\vec{p}$ placed in a uniform electric field $\vec{E}$ is given by the formu

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When the dipole is parallel to the electric field.

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(A) The torque $\vec{	au}$ acting on an electric dipole of dipole moment $\vec{p}$ placed in a uniform electric field $\vec{E}$ is given by the formula: $\vec{	au} = \vec{p} 	imes \vec{E}$.In terms of magnitude,this is expressed as $	au = pE \sin 	heta$,where $	heta$ is the angle between the dipole moment vector $\vec{p}$ and the electric field vector $\vec{E}$.For the torque to be zero,we must have $\sin 	heta = 0$.This occurs when $	heta = 0^{\circ}$ (stable equilibrium) or $	heta = 180^{\circ}$ (unstable equilibrium).Therefore,the torque is zero when the dipole is parallel or anti-parallel to the electric field.

When does the torque acting on an electric dipole in a uniform electric field become zero?

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