1.

A conducting wire of mass m slides down two smooth conducting bars, set at an angle 0 to the horizintal as shown in Fig. The separation between the bars is\[l\]. The system is located in the magnetic field B, perpendicular to the plane of the sliding wire and bars. The constant velocity of the wire is

A. \[\frac{mg\,R\,\sin \theta }{{{B}^{2}}{{l}^{2}}}\]
B. \[\frac{mg\,R\,\sin \theta }{B{{l}^{2}}}\]
C. \[\frac{mg\,R\,\sin \theta }{{{B}^{2}}{{l}^{5}}}\]
D. \[\frac{mg\,R\,\sin \theta }{B{{l}^{4}}}\]
Answer» B. \[\frac{mg\,R\,\sin \theta }{B{{l}^{2}}}\]


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