Surface resistance of an insulating material is reduced due to the______________?
Correct answer: C. both (A) and (b)
- A. smoky and dirty atmosphere
- B. humidity in the atmosphere
- C. both (A) and (b)
- D. neither (A) nor (b)
Explanation
Moisture forms a partially conducting film on an insulator, while smoke and dirt provide or retain contaminating conductive paths. Both effects lower surface resistance, especially under humid conditions.
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