Given,
Inner radius of torroid core, rl
Outer radius, r2 = 0.26 m
Number of turns, N = 3500
Current in the wire, I = 11 A
= 0.25 m
(i) The magnetic field is zero outside the toroid because, there is no current flowing on
outside of the torroid.
(ii) Magnetic field inside the core of the toroid,