A square loop of side $10 \mathrm{~cm}$ and resistance $0.7 \Omega$ is placed vertically in east-west plane. A uniform magnetic field of $0.20 T$ is set up across the plane in north east direction. The magnetic field is decreased to zero in $1 \mathrm{~s}$ at a steady rate. Then, magnitude of induced emf is $\sqrt{x} \times 10^{-3} \mathrm{~V}$. The value of $x$ is $\underline{\hspace{2cm}}$.