A rectangular current carrying loop is kept in a uniform magnetic field. What is the direction of the magnetic moment of the current loop? When is the torque acting on the loop maximum?
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The equivalent magnetic moment M of a planar current carrying conductor loop is in the direction perpendicular to the plane of the loop. The direction is given by the right hand thumb rule.
When the loop is placed in a magnetic field of strength B then the torque T on the loop is given by the equation:
Vector T = B X M
Where X is the cross product of vectors B and M.
Magnitude of the torque T = B M Sin θ
Where θ is the angle between the vectors B and M.
The torque is maximum when that angle is 90°. So the plane of the loop is parallel to the direction of magnetic field.
kvnmurty:
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