In a Hall-effect experiment, a current of 4.0 A sent lengthwise through a conductor 0.8 cm wide, 3.6 cm long, and 9 ?m thick produces a transverse (across the width) Hall potential difference of 8.0 ?V when a magnetic field of 1.7T is passed perpendicularly through the thickness of the conductor. From these data,
A) find the drift velocity of the charge carriers.
B) Find the number density of charge carriers.