u-form

Updated: July 3, 2026

When the poles are near together, the field is densest; when the magnet is bent back to a straight bar, the field is rarest or weakest, and a change in the form of the magnet from a U-form to a straight bar would result in a change of the magnetic field within its greatest limits.

A. E. (Amos Emerson) Dolbear - The Machinery of the Universe: Mechanical Conceptions of Physical Phenomena