A circular coil of diameter 15 mm having 300 turns is placed in a magnetic field of 30 mT such that the plane of the coil is perpendicular to the…

A circular coil of diameter $\displaystyle 15$ mm having $\displaystyle 300$ turns is placed in a magnetic field of $\displaystyle 30$ mT such that the plane of the coil is perpendicular to the direction of magnetic field. The magnetic field is reduced uniformly to zero in $\displaystyle 20$ ms and again increased uniformly to $\displaystyle 30$ mT in $\displaystyle 40$ ms. If the emfs induced in the two time intervals are $\displaystyle \mathrm{e}_{1}$ and $\displaystyle \mathrm{e}_{2}$ respectively, then the value of $\displaystyle \mathrm{e}_{1} / \mathrm{e}_{2}$ is