Question

A magnetomotive force is supplied by a current of 1 A through 100 turns. The magnetic circuit consists of a steel core of 1000 permeability, 10 cm long and 4 cm2 area and an air gap 1 cm long. Find the field intensity at the air gap in Oersted

Answer 1

We know that

$H=\frac{Ni}{L}$

$H=\frac{100\times1}{0.1}=1000A/m$

$B=\mu_r\mu_0H$

Put value

$\mu_r=1000$

Find B value

$B=124.4T$