As a current flows through a conducting strip of rectangular section with the strip traversed by a magnetic field at right angles to the direction of the current, a voltage - the so-called Hall voltage - is produced between two superposed points on opposite sides of the strip.
This phenomenon arises from the Lorentz force: the charge carriers giving rise to the current flowing through the sample are deflected in the magnetic field B as a function of their sign and their velocity. Since negative and positive charge carriers in semiconductors move in opposite directions, they are deflected in the same direction. The type of charge carrier causing the flow of current can therefore be determined from the polarity of the Hall voltage, knowing the direction of the current and that of the magnetic field.
In this experiment, the Hall voltage is measured at room temperature and constant magnetic field as a function of the control current and plotted on a graph (measurement without compensation for defect voltage). The Hall voltage can also be measured as a function of the magnetic induction at room temperature. The sign of the charge carriers and the Hall constant together with the Hall mobility mH and the carrier concentration can be calculated from the measurements.
Includes Hall effect module; Hall effect, p-Ge; carrier board; coil, 600 turns; laminated U-shaped Iron core; pole pieces; Hall probe; power supply, 0-12 V DC/6 V, 12 VAC; tripod base; support rod; right angle clamp; connecting cords, digital Teslameter; digital multimeter; and manual on CD-ROM.
For your convenience this experiment is available to you as a complete set.
Everything you require to perform the activities are included in the total price.
For assistance in using your new equipment we also offer professional development (WLS1808-24) on all PHYWE line products.
For customization options and pricing please contact your local Cenco representative.
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