Numerical - Resistivity of insulating material of given insulation resistance of single core cable

Q.  A single core cable 5 km long has an insulation resistance of 0.35 M Ω. The core diameter is 20 mm and the diameter of the cable over the insulation is 50mm. What will be the resistivity of the insulating material?
- Published on 18 Dec 15

a. 13 * 109 Ω m
b. 12 * 109 Ω m
c. 13.5 * 109 Ω m
d. 12.85 * 109 Ω m

ANSWER: 12 * 109 Ω m

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    Discussion

  • sumit   -Posted on 22 Feb 17
    Please give me details of answer
  • minyahil   -Posted on 06 Dec 16
    if the answer is with deteail explanation or with formula it is best

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