A toroid with a square cross section carries current i.The magnetic field has its largest magnitude:
A)at the center of the hole
B)just inside the toroid at its inner surface
C)just inside the toroid at its outer surface
D)at any point inside (the field is uniform)
E)at none of the above

Question

Quizplus · Accepted Answer

The magnetic field inside a toroid is strongest just inside at its inner surface because the magnetic field lines are closer together there, indicating a stronger field. This is due to the geometry of the toroid and how the magnetic field lines are distributed within it.

A Toroid with a Square Cross Section Carries Current I