Finding capacitance per unit length

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To find the capacitance per unit length of a coaxial cable with an inner radius of 2.0mm and an outer radius of 4.0mm, the relevant formula is C = (2πε) / ln(r2/r1), where ε is the permittivity of the dielectric material. Given that the dielectric constant is 2.3 for polyethylene, the permittivity can be calculated as ε = ε0 * dielectric constant, with ε0 being the vacuum permittivity. The logarithmic term involves the ratio of the outer radius (r2) to the inner radius (r1). Proper application of these formulas will yield the capacitance per unit length needed for the video studio installation.
tnutty
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Homework Statement



You are planning to install a home video studio. A very important piece of information is missing from the specifications. You must find the capacitance per unit length for a coaxial cable. The cable has an inner radius of 2.0mm and an outer conductor 4.0mm in radius separated by polyethylene insulation that acts as a dielectric, with it equaling to 2.3.

What's the capacitance per unit length?

The dielectric is 2.3 according to my book.

I am not sure how the setup for this problem should be.
 
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You omitted the section about relevant formulas and equations. Do you have any formula for the capacitance of a coax conductor?
 

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