A square loop of side 10 cm and resistance 0.5 $\Omega $ is
placed vertically in the east-west plane. A uniform magnetic field of
0.10 T is set up across the plane in the north-east direction. The
magnetic field is decreased to zero in 0.70 s at a steady rate. Determine
the magnitudes of induced emf $\varepsilon$ and current $I$ during this time-interval.