Physics - Magnetism Question with Solution | TestHub

A long solenoid has 200 turns per $\mathrm{cm}$ and carries a current $\mathrm{i}$. The magnetic field at its centre is $6.28\times 10^{-2}$ Weber $/{\mathrm{m}}^2$. Another long solenoid has 100 turns per $\mathrm{cm}$ and it carries a current $\mathrm{i}/3$. The value of the magnetic field at its centre is