A rough inclined plane inclined at angle of `37^(@)` with horizontal has a metallic wire of length `20cm` with its length `_|_` to length of inclines plane `(mu=0.1)` When a current of its passingthrough the wire and a magnetic field is applied normal to the plane upwards, the wire starts moving up with uniform velocity for `B=0.5T`. The find the magnitude of current `i,(` mass of the wire `=50g)`

Explanation

When the wire is in equilibrium `Bil=mg sin theta+f`
`Bil=mg(sin theta+mu cos theta)`
`Bil =5xx10^(-2)xx10((3)/(5)+0.1xx(4)/(5))i=(10^(-1)xx3.4)/(10^(-1))=3.4A`