Find the current in the wire PQ for the configuration shown in Fig. Wire PQ has negligible resistance. B, the magnetic field is coming out of the paper. `theta` is a fixed angle made by PQ travelling smoothly over two conducting parallel wires seperated by a distance d.

Explanation

The motional electric field E along the dotted line CD(`wedge` to both v and B and aolng VxB)=Vb
Therefore, the motional emf along PQ=(length PQ)x(Field along PQ)
`("length "PQ)xx(vBsintheta)`
`=((d)/(sintheta))xx(vBsintheta)=vBd`