A strip of copper 3.0 cm wide carries a current I = 28.5 A to the right (see figure below). The strip is in a magnetic field B = 7.0 T into the page.
(a) What is the direction of the average magnetic force on the conduction electrons?
upward/downward
(b) The Hall voltage is 24.5 µV. What is the drift velocity?
mm/s