P. 4354. A 12 cm long bar magnet is placed vertically above the centre of a horizontal, fixed, open conducting ring, such that the lower end of the magnet is 4 cm from the centre of the ring. The magnet is dropped and when its lower end reaches the plane of the ring the induced e.m.f. between the ends of the ring is +2 V. What are the magnitude and the polarity of the induced e.m.f. at the instants when the centre of the magnet, and when the upper end of the magnet passes the centre of the ring?
Solution (in Hungarian)