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Experiment: find electron charge with circuit

  1. Dec 1, 2011 #1
    does anyone know of ANY experiment that uses circuit to find charge of an electron? If so, do you have link? I'm trying to figure out how it would work in essence. any input would be great.
  2. jcsd
  3. Dec 1, 2011 #2


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    Staff: Mentor

  4. Dec 1, 2011 #3
    tried that didn't get me anywhere.
  5. Dec 1, 2011 #4


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    Gold Member


    In order to measure the charge of an electron you need some fairly complicated laboratory equipment. Here is an example from George Mason University:

    "In this experiment we will measure a fundamental property of the electron, the ratio of
    its charge to its mass.
    In the experiment, a beam of electrons accelerated by a potential difference is bent into
    a circular path by a magnetic field. The beam is in a glass container containing a small
    amount of gas of a fluorescent molecule. Some of the electrons in the beam collide with
    these molecules, and this results in the emission of light. This process produces a visible track corresponding to the electron beam, so the radius of curvature of the electrons may be measured by eye. By also measuring the accelerating voltage of the electrons, and the strength of the magnetic field the electron's charge to mass ratio is determined.”

    See: physics.gmu.edu/~ellswort/p263/eoverm.pdf
  6. Dec 2, 2011 #5
  7. Dec 2, 2011 #6
    You can measure shot noise in some electronic device.
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