PX157 - C9 - magnetic dipole moment

introduction

• magnetic dipole moment:

• dipole moment experiences a torque in an externally applied magnetic field:

• this acts to align $\overrightarrow{\mu }$ with ${\overrightarrow{B}}_0$
• but the current in $\overrightarrow{\mu }$ generates a dipole magnetic field, which is parallel to $\overrightarrow{\mu }$ along the axis of the current loop