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A wire of length l, mass m and resitance...

A wire of length l, mass m and resitance R slides without any friction down the parallel conducting rails of negligible resistance (Fig). The rails are connected to the wire so that the wire and the rails form a closed rectangular conducting loop. The plane of the rails makes an angle `theta` with the horizontal and a uniform vertical magnetic field of induction B exists throughout the region. Find the steady-state velocity of the wire

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`(mg R sin theta)/(B^(2)l^(2) cos^(2) theta)`
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