Network Analysis and Synthesis - ECE Questions and Answers

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A wire has a diameter d and resistance R. If the diameter is made 3d, the length and material remaining the same, the new value of resistance will be

R/3

3 R

R/9

9 R

Answer : Option C

Explanation :

Since diameter is 3d, area of cross-section is increased 9 times. Therefore, resistance is R/9.

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