Re: Re: [TCML] Re: Spark models, revisited

["Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>]

On 21/10/2012 14:45, Udo Lenz wrote:
> If I apply the equations for a wire of 0.2 mm diameter 1 m
> above a conducting plane from
> http://en.wikipedia.org/wiki/Capacitance
> I get 5.6 pF/m. For 11.1 pF/m I would need wire diameter of 2.7 cm.

That formula doesn't work if the distance of the plane is large (gives 
zero capacitance). A better approach is to consider the capacitance of a 
thin toroid in free space, that can be calculated exactly (discussions 
in the archives of the list, years ago) and divide the capacitance by 
the toroid circunference.

Antonio Carlos M. de Queiroz

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