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Default Coax cable calculation

On Tuesday, April 10, 2018 at 2:42:50 AM UTC-4, Trevor Wilson wrote:
Here's a question that stumped me back in the old slide rule days:

A coaxial cable, having an inner diameter of 0.0254mm (0.001") and using
an insulator with a dielectric constant of 2.56, is yo have a
characteristic impedance of 2,000 Ohms. What must be the outer conductor

You guys can locate the appropriate method of calculation.

Trevor Wilson

It's pretty hard to get impedances above that of free space.
(377 ohms) An air gap would be better.