Question

Figure shows a rod of length l and resistance r moving on two rails shorted by a resistance R. A uniform magnetic field B is present normal to the plane of rod and rails. Show the electrical equivalent of each branch.

Answer 1

emf induced in rod PQ is $\epsilon$

$B=\epsilon =VBl=VB$

Fig.2 shows electrical equivalence,

$I=\frac{\epsilon }{R}=\frac{VB}{R}$