A metal wire with mobile electrons and square cross section carries a conventional current I in the −y direction. There is a
magnetic field B in the +x direction. Draw a diagram illustrating the situation, to help you answer the following questions.
(a) What is the direction of , the electric field that causes the current to flow?
(b) What is the direction of the drift velocity of the mobile electrons?
(c) What is the direction of the magnetic force on the moving electrons?
(d) What is the direction of , the electric field due to the Hall effect, inside the wire?
(e) If the mobile charges had been positive (holes) instead of negative, what would have been the direction of the
magnetic force on the moving positive charges?
(f) If the mobile charges had been positive instead of negative, what would have been the direction of the transverse
electric field?