A copper bar of mass m sides under gravity on two smooth parallel rails l distance apart and set at angle `alpha` to the horizontal . At the lop , the
A copper bar of mass m sides under gravity on two smooth parallel rails l distance apart and set at angle `alpha` to the horizontal . At the lop , the rails are joined by a resistor R. Calculate the steady velocity of the bar the n when there is a unifrom magnetic field B perpedicular to the plane of the rails .
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