A) torque experienced by the dipole is \[\overrightarrow{E}\times \overrightarrow{p}\]
B) torque is zero, if \[\overrightarrow{p}\] is perpendicular to \[\overrightarrow{E}\]
C) torque is maximum, if \[\overrightarrow{p}\] is perpendicular to \[\overrightarrow{E}\]
D) potential energy is maximum, if \[\overrightarrow{p}\] is parallel to \[\overrightarrow{E}\]
Correct Answer: C
Solution :
(c) torque is maximum, if \[\overrightarrow{p}\] is perpendicular to \[\overrightarrow{E}\] Torque on dipole form \[\tau =p\times E\,\sin \theta\] The direction of torque is perpendicular to the plane of paper inwards, i.e., when the dipole is parallel or anti parallel to \[\overrightarrow{E}\] and maximum at \[\theta =90{}^\circ\] . So, torque is maximum, if \[\overrightarrow{p}\] is perpendicular to \[\overrightarrow{E}\] .
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