Physics - Magnetism Question with Solution | TestHub

Given, 

Number of turns per metre $n=\frac{1200}{2}$

 $l= 2 \mathrm{m}, d=0.2 \mathrm{m} \text{and} I=2 \mathrm{A}$

Magnetic field at centre inside the solenoid is given by $\mathrm{B}={\mu }_0\mathrm{nI}$, where, ${\mu }_0$ is the permeability constant.

Magnetic intensity is related to magnetic field by 

$\mathrm{H}=\frac{\mathrm{B}}{{\mu }_0}=\frac{{\mu }_{0}nI}{{\mu }_0}=nI=\left(\frac{1200}{2}\right)\left(2\right)$

$\Rightarrow \mathrm{H}=1.2\times {10}^3 \mathrm{A} {\mathrm{m}}^{-1}$