51. The toroid diameter D = 40 cm (midline), and S = the cross section area of 10 cm2 contains N = 1200 turns. Calculate the magnetic field energy of the toroid at a current I = 10 A. The core is made of a nonmagnetic material. The magnetic field is homogeneous throughout the entire volume.

Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)