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Q: A material of length l and area of cross section A has a resistance R. What should be changes in the area of cross section A if its length is tripled to produce the same resistance R?
  • A. The area of cross section should be decreased by 9 times.
  • B. The area of cross section should be increased by 9 times.
  • C. The area of cross section should be increased by 3 times.
  • D. The area of cross section should be decreased by 3 times.
Correct Answer: Option C - If its length is tripled to produce the same resistance R. The area of cross section should be increased by 3 times.
C. If its length is tripled to produce the same resistance R. The area of cross section should be increased by 3 times.

Explanations:

If its length is tripled to produce the same resistance R. The area of cross section should be increased by 3 times.