Chapter 5. Magnetostatics Problems 5.34 and 5.35
A circular loop of wire, with radius R, lies in the xy plane, centered at the origin, and carries a current I running counterclockwise as viewed from the positive z axis.
- What is its magnetic dipole moment?
- What is its (approximate) magnetic field at points far from the origin?
- Show that, for points on the z axis, your answer is consistent with the exact field as calculated in Example 6 of Griffiths.
A phonograph record of radius R, carrying a uniform surface charge ?, is rotating at constant angular velocity ?. Find its magnetic dipole moment.