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On 22/01/2015 11:26, Tim Flood wrote:
Yes, just be sure the total surface area of all your tubes is close to the
surface area of the toroid.
This is not necessary. The capacitance will be practically the same of a
solid toroid in any way, but the breakdown voltage will be smaller, this
in a sort of proportion of the ratio of externally exposed area to the
original area, because the charge will be more concentrated.