A) \[\vec{p}\times \vec{E}\]
B) \[\vec{p}\,.\,\vec{E}\]
C) \[\vec{p}\times \vec{E}\times \vec{p}\]
D) \[\frac{\vec{E}\,.\,\vec{p}}{{{p}^{2}}}\]
Correct Answer: A
Solution :
[a] If electric dipole is placed perpendicular to electric field, in this case net force on dipole will be zero but torque on dipole will not be zero. |
Torque \[\tau =pE\sin \theta \] |
or \[\vec{\tau }=\vec{p}\times \vec{E}\] |
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