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I have got a simple problem which makes me struggle.

I have a rectangular thin conductive sheet (2D) of width w, height h

and conductivity suspended in air.

I would like to calculate with COMSOL/Femlab the electrical resistance between one of the corners of the conductive sheet and any other point on the sheet?

I selected the 'conductive media DC' mode in 2D. I am not sure what

boundary condition I should choose and how to apply a potential to one

of the corners.

Since the sheet is suspended in air I thought of putting isolating

boundary conditions on all 4 sides, but then how will I apply the

potential to the corner? Somehow it does not give meaningful results.

Your help is greatly appreciated.

David