Question

A Hall-effect probe operates with a 120 -mA current. When the probeis placed in a uniform magnetic field of magnitude 0.0840 T, it produces a Hall voltage of0.640 µV.

(a) When it is used to measure an unknown magnetic field, the Hall voltage is 0.300 µV. What is the magnitude of the unknown field?
1 mT
(b) The thickness of the probe in the direction of B is 1.60 mm. Find the density of the charge carriers, each of which has charge of magnitude e).
2 m^-3

Answer 1