An east–west straight conducting rod moves vertically upward in a magnetic field directed north. In a suitable closed circuit, what is the direction of the induced conventional current along the rod?

Explanation

For the stated orientation, v points upward and B northward. The force on positive charge, proportional to v × B, points west. The rod must have an east–west component and a suitable closed circuit for a sustained induced current; otherwise the statement specifies emf polarity rather than a complete current path.