1) In a Hall experiment, a semiconductor carrying current in the
positive x-direction is exposed to a magnetic field in the positive
y-direction. (Assume a right-handed coordinate system.) If the
charge carriers are positively charged “holes,” in which direction
is: (a) the drift velocity, (b) the cross product of velocity and
magnetic field, (c) the Lorentz magnetic force, (d) the Hall
electric field? (e) Which of these vectors would change direction
if the charge carriers were not holes but electrons?...