Electricity and Magnetism > Semiconductors and Tubes
DCS# 5M10.10
HALL EFFECT
APPARATUS
p- or n-doped germanium in
sample mount
214-02-C2
strong bar magnet
206
digital multimeter
214-01-B
DC power supply
214-01-D
document camera
201
DESCRIPTION
Show that a potential difference
develops perpendicular to the current in a semiconductor when the
magnet is brought near the sample. Switching from N to P-type
germanium reverses the sign of the transverse voltage, indicating that
the charge carriers have the opposite charge.
NOTES
Connect the power supply to the P-
or N-type mounted germanium wafer and set the current to 40 mA.
Connect the voltmeter across the germanium and use the potentiometer on
the sample mount to zero the transverse voltage in the absence of a
magnetic field.
