Physics - Magnetism Question with Solution | TestHub

If in a circular coil $A$ of radius $R$, current I is flowing and in another coil $B$ of radius $2R$ a current $2\mathrm{l}$ is flowing, then the ratio of the magnetic fields ${\mathrm{B}}_{\mathrm{A}}$ and ${\mathrm{B}}_{\mathrm{B}}$, produced by them will be