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A wire PQ of mass 10g is at rest on two...

A wire PQ of mass 10g is at rest on two parallel metal rails.The separation betweem the rails is 4.9 cm.A magnetic field if 0.80 T is applied perpendicular to the plane of the rails, directed downwads. The resisitance of the circuit is slowly decreased. When the resistance to bleow 10 `Omega` the wire PQ begins to slide on the rails .Calculate the coefficient of friction between the wire and the rails

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Wire PQ begins to slide When magnetic force is just equal to the force of friction, i.e .,
`mu mg = il B sin theta (theta =90^0)`
Here, `i = (E)/(R) = 6/20 = 0.3 A, `
`mu = (ilB)/(mg) = ((0.3)xx(4.9 xx 10^(-2))(0.8))/((10xx 10^(-3))(9.8)) = 0.12`
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