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Van De Graaff Generator

  1. Sep 19, 2015 #1
    If you run a wire from the outside surface of the dome to the inside of the same dome, would it be possible to make a spark to the inside surface of the same dome?
     
  2. jcsd
  3. Sep 19, 2015 #2

    mfb

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    With a conducting connection between the two parts? No. They will be at the same potential.
     
  4. Sep 19, 2015 #3
    How come? The dome is at a higher potential than the belt thats charging it.
     
  5. Sep 19, 2015 #4

    mfb

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    Not at the point where the charges are extracted (neglecting the tiny resistances and current flow in the material).
     
  6. Sep 19, 2015 #5
    Okay, will this capacitor charge? The cap and ground are shielded from the belt and rotor.
     

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  7. Sep 19, 2015 #6

    mfb

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    How do you get a ground connection in the middle? If you take a cable out, it will charge.
     
  8. Sep 19, 2015 #7
    I just didn't want to clutter the diagram; but yes, a cable is going outside the dome to ground.

    I was always told that the inside of the dome is neutral or had no potential.
     
  9. Sep 19, 2015 #8

    mfb

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    It has no electric field - unless you add a connection to ground. That's not the same as no potential (which does not exist anyway - a potential can be zero but it cannot be nonexistent).
     
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