In a Hall-effect experiment, a current of 2.9 A sent lengthwise through a conductor 0.89 cm wide, 3.1 cm long, and 8.5 µm thick produces a transverse (across the width) Hall potential difference of 9.0 µV when a magnetic field of 1.7 T is passed perpendicularly through the thickness of the conductor. From these data, find
(a) the drift speed (in m/s) of the charge carriers and
(b) the number density of charge carriers (in m-3).