Question

An infinite solenoid (n turns per unit length, current I ) is filled with linear material of susceptibility χm. Find the magnetic field inside the solenoid.

Answer 1

Gives

Turn per unit length =n

Length =l

susceptibility =$\chi$

We know that

Magnetic field inside the solenoid

$B=\mu_0\mu_rni$

Where $\mu_r=1+\chi$

Then put value $\mu_r$

$B=\mu_0(1+\chi)ni$

Where $n=\frac{N}{l}$