A circular coil of radius 10 cm, 500 turns, and resistance 2 Ω is placed with its plane perpendicular to the horizontal component of the earth’s magnetic field. It is rotated about its vertical diameter through 180° in 0.25 s. Estimate the magnitudes of the emf and current induced in the coil. The horizontal component of the earth’s magnetic field at the place is 3.0 × 10–5 T.