Capacitance per unit length help

  • Thread starter budget76
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  • #1
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1. Homework Statement [/b]
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 1.1 {\rm mm} and an outer conductor 3.1 {\rm mm} in radius separated by polyethylene insulation that acts as a dielectric.


Homework Equations


(2pi*k*epsilon_0) / (ln(b/a))


The Attempt at a Solution



I attempted to use the above formula but do not know what k is, and found on a different website the formula without k so I attempted to use it and got 54.52, which was wrong.

thanks for any help
 

Answers and Replies

  • #2
kuruman
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Did you look up the dielectric constant of polyethylene? That's what k is.
 
  • #3
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I did not, I'll give it a try. Thank you
 

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