Question

A thick metal slab carries a current I. A uniform magnetic field B points perpendicular to the slab (and into the page). If point P on the slab is at a higher potential than point , what can we say about the charge carriers that produce the current in the slab?

Answer 1

http://courses.washington.edu/phys431/hall_effect/hall_effect.pdf

Answer 2

Think about conventional current.