A straight wire of length l can slide o...

A straight wire of length l can slide on two parallel plastic rails kept in a horizontal plane with a separation d. The coefficient of friction between the wire and the rails is `mu`. If the wire carries a current I, what minimum magnetic field should exist in the space in order to slide the wire on the rails.

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The minimum magnatic force of the body
` mumg = iBL`
` B= (mumg)/(il) .

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