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Question

A circular coil of 25 turns and radius 12 cm is placed in a uniform magnetic field of 0.5 T normal to the plane of the coil. If the current in the coil is 6 A then total torque acting on the coil is

A
zero
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B
3.4 N m
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C
3.8 N m
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D
4.4 N m
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Solution

The correct option is A zero
The torque acting on the coil τ=|¯m X ¯B | =mBsinΘ
Here the circular coil is placed normal to the direction of magnetic field then the angle between the. direction of magnetic moment (¯m) and magnetic field (¯B) is zero, then
τ = mBsinΘ = mBsin0 = 0 τ=0

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