# Torque and magnetic moment

1. Nov 15, 2007

### pardesi

when we write $\vec \tau=[\vec \mu, \vec B]$
what is the point or the line about which we are calcuating the torque
Also what is the magnetic moment's expression for a surface current and volume current distribution?

2. Nov 16, 2007

### Shooting Star

The moment of magnetic dipole is independent of the origin. The torque is a pure couple and so it too is independent of the choice of origin.

Last edited: Nov 16, 2007
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