Question

A metallic meter stick moves with a velocity of `2m//sec` in a diretion perpendicular to its length and perpendicular to a uniform magnetic firld of magnitude `0.2T` . The emf induced between the ends of the stick

Answer 1

The negative terminal is that end toward which elections are moving due to magnetic force. The magnetic force on electron is acting along `B` , hence `B` is `-ve` terminal of battery.
`e=Bvl=0.2xx2xx1=0.4V`