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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 correct Answer is:
A, B
Minimum required force to overcome friction
`(mumg)/sqrt(1+mu^(2))=Bilsin thetarArrB=(mumg)/(ilsqrt(1+mu^(2) sin theta) )rArrB_(min)=(mumg)/(ilsqrt(1+mu^(2)))`
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RESONANCE ENGLISH-ELECTRODYNAMICS-Exercise-1 PART-1
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