Question

The conducting rod $ab$, as shown in figure makes contact with metal rails $ca$ and $db$. The apparatus is in a uniform magnetic field of $0.800T$, perpendicular to the plane of the figure. In what direction does the current flow in the rod?

• A. b to a
• B. a to b
• C. a to b and then b to a
• D. a to c

Answer 1

The correct option is A b to a

By fleming's left hand rule, pointing the right hand's index finger towards the magnetic field and the thumb along velocity, it can be concluded that the current flows from b to a.