The Hall Effect
In this experiment you will determine the Hall Constant of a sample of InAs semiconductor. This principle is at work within many instruments that read or depend on the value of a magnetic field such as a Gaussmeter.
|
The top voltmeter measures the voltage across the resistor in the drift current circuit. The bottom voltmeter measure the hall voltage directly. A small current amplifier is labeled "I Amp" and ensures that the steps from the computer are faithfully translated into drift current. |
|
Left to Right: Gaussmeter Control Box, Gaussmeter Probe, Current Source for electromagnet, Electromagnet, Hall Sample. |
|
1. Electrons, 2. Hall sample, 3. Magnet Poles, 4. Magnetic Field, and 5. Drift Current Source. Accumulation of negative charge is denoted by the blue shade at the top of the hall sample. Note the equivalent hall voltages in pictures A and D. |
