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Figure shows two long metal rails placed horizontally and parallel to each other at a separation $l$. A uniform magnetic field B exists in the vertically downward direction. A wire of mass m can slide on the rails. The rails are connected to a constant current source which drives a current i in the circuit. The friction coefficient between the rails  and the wire is µ  . What should be the minimum value of µ  which can prevent the wire from sliding on the rails?
 

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