A toroid has core (non-ferromagnetic ) of inner radius 25 cm and outer radius 26 cm, around which 3500 turns of a wire are wound. If the current in the wire is 11 A, what is the magnetic field (i) outside the toroid , (ii) inside the core of the toroid, and (iii)in the empty space surrounded by the toroid.

Explanation

i. Zero
`ii. B=mu_0 NI = (4pi xx 10^(-7) xx 3500 xx 11)/(2 pi xx 25.5 xx 10^(-2))=3.0 xx 10^(-2) T`
iii. Zero