The current carrying wire and the rod AB are in the same plane. The rod moves parallel to the wire with a velocity v. Which one of the following statements is true about induced e.m.f. in the rod?

Magnetic force acting on each free electron in the rod is given by  F→ =(-e) v→×B.→ Since F→is directed from end A to end B , free electrons are accumulated at end B. As a result end A is at positive potential and end B is at negative potential.