Question

A toroidally wound coil has an inner radius of 15 cm, an outer radius of 20 cm and is wound with 1500 turns of wire. What is the magnitude of the magnetic induction at the centre of the coil when the current in the winding is 10 A ?

Answer 1

Data : Central radius, 

r = \(\cfrac 12\) (15 + 20) = 17.5 cm 

= 0.175 m, N = 1500, 

I = 10 A, \(\cfrac{\mu_0}{4\pi}\) = 10^-7 T∙m/A 

The magnetic induction,