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Magnetic Dipole Moment

It is the product of current and area of the loop; its direction is normal to the plane of the loop; its unit is Am2.
Description: 76515.png
In terms of the magnetic dipole moment, the torque can be written as,
Description: 74479.png


  1. This expression is applicable in determining torque on a planar loop of any arbitrary shape.
  2. The torque is in the direction of the axis of rotation. It is directed so as to reduce the angle θ, so that Description: 76495.png and Description: 76488.png are in the same direction. In equilibrium, the loop is perpendicular to the magnetic field and thus, both torque and force on the loop are zero.

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