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Author Question: What is the resistance of 1 000 m of 4-mm diameter copper wire? (Cu = 1.7 10-8 / ... (Read 139 times)

future617RT

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on: Jul 28, 2018
What is the resistance of 1 000 m of 4-mm diameter copper wire? (Cu = 1.7  10-8  / m)

Question 2

A high-resistance material is used as an insulator between the conductors of a length of coaxial cable. The resistance material, which forms a hollow tube, has an inner radius a and an outer radius b, and the insulator provides a resistance R between the conductors. If a second insulator, made of the same material and having the same length, is made with double both the inner radius and the outer radius of the first, what resistance would it provide between the conductors?
 a. R
  b. 2 R
  c. 4 R
  d. (ln2)R
  e. R/(ln2)


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Joc

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Reply #1 on: Jul 28, 2018
Answer to Question 1

1.35 ohm

Answer to Question 2

a


future617RT

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Reply #2 on: Jul 28, 2018
Both answers were spot on, thank you once again


Joc

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Reply #3 on: Jul 28, 2018
Great! Please up vote :D


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