Task id13088
The plane of the rectangular wire frame abcd is perpendicular to a uniform magnetic field with induction B (Fig. 130). One side of the frame bc = L is movable and slides without breaking contact at a constant speed v along sides ab and dc. A light bulb with resistance R is connected between points a and d. The resistance of the rest of the frame can be neglected. What force must be applied to side bc to achieve such a movement? B = 10-3 tl, L = 1 cm, V = 10 cm/sec, R = 5 ohm.
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