A) the plane of the coil is perpendicular to the field
B) the normal to the plane of the coil is parallel to the field
C) the normal to the plane of the coil is perpendicular to the field
D) the plane of the coil is making an angle of \[45{}^\circ \] with the field
Correct Answer: C
Solution :
(c) the normal to the plane of the coil is perpendicular to the field. \[\overrightarrow{\tau }=\overrightarrow{M}\times \overrightarrow{B}\] \[=niAB\,\sin \theta \] So, \[sin\theta \] is maximum when \[\theta =90{}^\circ \] and \[\theta \] is normal between normal of plane of coil and field. So, the normal to the plane of the coil should be perpendicular to the field to produce maximum torque.
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