Question

If we immerse a circular coil of 190 mm diameter into a material of relative permeability of 3 and the coil conducts a current of 8a, find the magnetic induction at the center of the coil

Answer 1

a)

`B=(\mu\mu_0 I)/(D)=1.6\cdot 10^(-4)~T,`

b)

`B=\mu_0I\frac N{2\pi r}=9.6\cdot 10^(-4)~T.`