28. Magnetic Fields and Forces

A square loop of wire has a side length of $12\mathrm{ cm}$ and carries a $10\text{A}$ current. What is the size of its magnetic dipole moment?

A single circular loop of wire has a radius of $2.0\mathrm{cm}$, and carries a current of $4.0\text{A}$. What is the maximum torque that could be experienced by this loop due to earth's magnetic field?