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Van der Graff

  1. Sep 21, 2009 #1
    1. A spherical dome of a Van der Graaff genenerator can be raised to a maximum electrical
    potential of 600 kV; then additional charge leaks off in sparks as the electric field reaches 3.0
    MV/m. Determine the charge and radius of the dome.

    2. Relevant equations[E=kq/r^2 and V=kq/r]

    3. I don't know how to relate the given Voltage and the given E field to find charge and radius
  2. jcsd
  3. Sep 22, 2009 #2


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    Science Advisor
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    You'll use the equations you quoted, for the values given in the problem statement.


    3.0 MV/m = kq/r^2
    600 kV = kq/r

    Work with those to get r and q.
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