Finding Centre of Hemisphere - Radius a

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SUMMARY

The discussion focuses on determining the z-coordinate that corresponds to the center of a hemisphere with radius a, specifically when the hemisphere is oriented with its axis along the z-axis and its base in the x-y plane. The initial suggestion of z = a/2 is debated, with a consideration that the correct value may be z = a/√2. The context involves calculating the electric field at the center of the charged hemispherical surface, clarifying that the center of mass is not the intended point of reference.

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latentcorpse
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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?
 
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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?
 
i don't 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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