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Hemisphere Centre

  1. Apr 13, 2009 #1
    imagine a hemisphere of radius a with the circle lying in the x-y plane and so the axis of the hemisphere is the z axis. if z=0 is at the centre of our circle, what value of z corresponds to the centre of the hemisphere?

    i used z=a/2 but have a sneaky feeling its' meant to be [itex]\frac{a}{\sqrt{2}}[/itex]

    can anyone help?
     
  2. jcsd
  3. Apr 14, 2009 #2
    Do you want the CENTER OF MASS?

    Are you looking at the top half of a solid sphere centered at the origin with radius a?
     
  4. Apr 14, 2009 #3
    i dont want the centre of mass. yes your talking about the right shape.

    basically i have an expression for the electric field on the z axis as the hemispherical surface is charged and it asks me to find the value of the electric field at the centre of the hemisphere - what z value should i use?
     
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