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Homework Help: Capacity numerical

  1. Jun 28, 2012 #1
    1. The problem statement, all variables and given/known data:

    Taking earth to be a spherical conductor of diameter 12.8x10^3 km.its capacity will be?

    3. The attempt at a solution:
    if earth is to be taken as a conductor than i think following formula shall be used
    where A=pie r^2
    but how i'll calculate distance?(if the above formulae will be used)
  2. jcsd
  3. Jun 28, 2012 #2
    Hi lionel :tongue2:

    d is the radius of Earth. But the area is not [itex]\pi r^2[/itex]. You need to find the outer surface area....what is the surface area of a sphere?
  4. Jun 28, 2012 #3
    got it....! thanks :D..
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