Drift velocity and copper wire

  • Thread starter hoyy1kolko
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  • #1
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Homework Statement


A copper wire of diameter 2.00mm carries a current of 0.50A.The number of conducting electrons per metre cube of copper is 8.00 x 10^28.
a)Calculate the drift velocity of the conducting electrons.
b)What is the number of conducting electrons in 10.0cm length of the wire


Homework Equations


I=nave
v=I/nae


The Attempt at a Solution


a) I=nave
v=I/nae
= 0.50/(8.00x10^25)(1x10^-3)(1.6x10^-19)
=3.9 x 10^-5 ms^-1
b)I=nave
n=I/ave
=0.50/(1x10^-3)(3.9x10^-5 )(1.6x10^19)
=8.0x 10^-3

The answer that i get is wrong.i dunno why.I need help and explanation.Is it need to derivate the formula then calculate?Thank you.
 

Answers and Replies

  • #2
kuruman
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What formula did you use to calculate a?
 
  • #3
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i dunno how to calculate a.I need help.
 
  • #4
kuruman
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i dunno how to calculate a.I need help.
We help those who help themselves. What does a represent? Look at the same place where you got the equation for the drift velocity.
 

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