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Question

# A rectangular coil of wire carrying a current is kept in a uniform magnetic field. The torque acting on the coil will be maximum when

A
the plane of the coil is perpendicular to the field
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B
the normal to the plane of the coil is parallel to the field
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C
the normal to the plane of the coil is perpendicular to the field
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D
the plane of the coil is making an angle of 45o with the field
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Solution

## The correct option is B the normal to the plane of the coil is perpendicular to the field→τ=→M×→B=niABsinθSo, sinθ is maximum when θ=90oand θ 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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