An $800$ turn coil of effective area $0.05\,\text{m}^2$ is kept perpendicular to the magnetic field $5 \times 10^{-5}\,\text{T}$. When the plane of the coil is rotated by $90^\circ$ around any of its coplanar axis in $0.1\,\text{s}$, the emf induced in the coil will be