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Homework Help: Hall Effect Lab (Germanium SC) Without Hall Effect Sensor

  1. Feb 22, 2014 #1
    1. Lab Method

    The method for determining the Hall Effect is as follows:
    This is the method that I was instructed to follow:

    • A current source was connected across a germanium wafer

    • The voltage across the wafer (in the direction of current) was measured with a multimeter

    • A magnetic field was introduced

    • The voltage, in the direction of current was measured again

    • The difference in measured voltage 1 and measured voltage 2 was assumed to be the approximate value of the Hall Voltage

    • This method was repeated for both p-type and n-type germanium semiconductors

    2. Required Calculations

    From these measurement the hall coefficient, magnetic field strength, the type of charge carrier and the charge density of the semiconductor need to be calculated

    3. The attempt at a solution

    The problem I'm having is that most reports and methods I've found that show equations for the above quantities are for a Hall Effect experiment that uses a Hall sensor to measure the magnetic field strength. This is the main problem I'm having because if I had a value for B I would be able to calculate all of the other values. Is there a way to calculate B with the measurements that I have?

    Any help would be appreciated
  2. jcsd
  3. Feb 23, 2014 #2

    Simon Bridge

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    Science Advisor
    Homework Helper

    The hall voltage is perpendicular to the current direction - the magnetic field should not affect the voltage in the current direction - which is usually maintained at a fixed value by a power supply. Check you have understood the instructions properly.

    If you know the current and the hall voltage, then you can use the hall effect equations to calculate the magnetic field strength.
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