The magnetic field inside a toroidal solenoid of radius $R$ is $B$. If the current through it is dou

Question

The magnetic field inside a toroidal solenoid of radius $R$ is $B$. If the current through it is doubled and its radius is also doubled keeping the number of turns per unit length the same, magnetic field produced by it will be\

Professor PC Thomas Classes · Answer

$B=\mu_{0} n I \quad \ldots .(1)$ where $n$ is the number of turns per meter\ $\mathrm{B}^{\prime}=\mu_{0} \mathrm{n} 2 \mathrm{I}$\ $\mathrm{B}^{\prime}$