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A wire of mass m and length l can slide ...

A wire of mass `m` and length `l` can slide freely on a pair of fixed, smooth.vertical rails (figure).A magnetic field `B` exists in the region in the direction perpendicular to the plane of the rails.The rails are connected at the top end by an initially unchanged capacitor of capacitance `C`.Find the velocity of the wire at any time `(t)` after released.Neglecting any electric resistance.(initial velocity of wire is zero)

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The correct Answer is:
`(mg)/(m+CB^(2)l^(2))`
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