Resistance of copper wires

  • Thread starter zelda1850
  • Start date
  • #1
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Homework Statement



a copper wire of length 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 1/2 A. what is the resistance of the second copper wire?

Homework Equations



R = pL/A

L = 2
A = 1/2
p = how do i find p

The Attempt at a Solution



p stand for resistivty but how do i know it in this problem
 

Answers and Replies

  • #2
rl.bhat
Homework Helper
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In the relevant equation replace L by 2L and A by A/2 to get new resistance.
 
  • #3
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oh should the answer come out to be 1R
 
  • #4
ideasrule
Homework Helper
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yes.
 
  • #5
rl.bhat
Homework Helper
4,433
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oh should the answer come out to be 1R
No.
New resistance R' = ρ*2L/A/2 = .......?
 
  • #6
66
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i think p would be 1.72 x 10 exponent -8 since it is on copper
so i do 1.72x10 exponent -8 * 2 m/ 2 a is that the right equation?
 

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