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A copper wire of length L and cross-sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross-sectional area of A. What is the resistance of the second
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May 14, 2022
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A copper wire of length L and cross-sectional area A has resistance R. A second copper wire at the same temperature has a length of 2L and a cross-sectional area of A. What is the resistance of the second copper wire?
A. 2R
B. 4R
C. R
D. 1/2 R
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Answer: 4R
Explanation:R=pL/A
R second wire=p2L/1/2A
=4R
Guilherme Rambo
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May 19, 2022
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Guilherme Rambo
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