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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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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

User MaPo
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5.7k points

1 Answer

14 votes

Answer: 4R

Explanation:R=pL/A

R second wire=p2L/1/2A

=4R

User Guilherme Rambo
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