Physics - Magnetism Question with Solution | TestHub

The magnetic induction $B$ at the centre of a long solenoid is given by $B={\mu }_{0}nI$.

The magnetic field intensity $H$ is related to the magnetic induction $B$ in free space by the relation $H=\frac{B}{{\mu }_0}$.

Substituting the value of $B$, we get $H=\frac{{\mu }_{0}nI}{{\mu }_0}=nI$.

Answer: nI