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The insulation resistance of a cable of 10 km length is 1 MΩ. The resistance for a length of 40 km is
  • a)
    1 MΩ
  • b)
    4 MΩ
  • c)
    0.25 MΩ
  • d)
    Can’t be determined
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
The insulation resistance of a cable of 10 km length is 1 MΩ. Th...
It seems amazing that Insulation Resistance (IR) of a Cable is inversely proportional to the length of Cable. As per our general perception, the resistance is directly proportional to length of conductor but mind here that it is not the resistance of conductor rather it is the resistance of the Insulation provided around the conductor.
The insulation resistance of a cable,

Ri2 = 0.25 MΩ
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The insulation resistance of a cable of 10 km length is 1 MΩ. The resistance for a length of 40 km isa)1 MΩb)4 MΩc)0.25 MΩd)Can’t be determinedCorrect answer is option 'C'. Can you explain this answer?
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