Resistance of copper wires

  • Thread starter zelda1850
  • Start date
  • #1
66
0

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
4,433
8


In the relevant equation replace L by 2L and A by A/2 to get new resistance.
 
  • #3
66
0


oh should the answer come out to be 1R
 
  • #4
ideasrule
Homework Helper
2,271
0


yes.
 
  • #5
rl.bhat
Homework Helper
4,433
8


oh should the answer come out to be 1R
No.
New resistance R' = ρ*2L/A/2 = .......?
 
  • #6
66
0


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?
 

Related Threads on Resistance of copper wires

Replies
1
Views
2K
  • Last Post
Replies
4
Views
378
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
6
Views
14K
  • Last Post
Replies
2
Views
31K
  • Last Post
Replies
12
Views
3K
  • Last Post
Replies
1
Views
5K
  • Last Post
Replies
1
Views
2K
Replies
8
Views
2K
  • Last Post
Replies
10
Views
12K
Top