An iron wire has length 8.0 m and diameter 0.50 mm. The wire has resistance R. A second iron wire has length 2.0 m and diameter 1.0 mm. What is the resistance of the second wire?
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Answer:
use f1r1/A1=f2r2/A2 you will get the answer
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Answer: R/8
Explanation: Firstly diameter has square effect on area. Secondly convert it into m.
So in that case it will be 8 x 1x10-6 / 2 x 5x10-7
The Answer will be 8 which tells that R is 1/8.
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