Physics - EMI/AC Question with Solution | TestHub

Let the magnetic field is$B$at the centre of the primary coil. Considering it to be uniform, the magnetic flux passing through the secondary coil is

$\varphi =BA=\frac{{\mu }_0{i}_1}{2R_1}\left(\pi R_2^2\right)$

Now,$M=\frac{{\varphi }_2}{i_1}=\frac{{\mu }_0\pi R_2^2}{2R_1}$

$\therefore M\propto \frac{R_2^2}{R_1}$