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Calculating resistivity from relaxation time.

  1. Aug 15, 2011 #1
    Given the following data on copper, how do i calculate the resistivity?

    Relaxation time: 2.50e10-14s
    Density: 8940Kgm-3
    molar mass: 63.5g

    is there an equation for it.
     
  2. jcsd
  3. Aug 15, 2011 #2

    Dr Transport

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    the formula for the conductivity [itex]\sigma[/itex] is given by

    [itex]\sigma = \frac{ne^2 \tau}{m}[/itex] where [itex] n [/itex] is the density, [itex] e [/itex] is the electrical charge, [itex] \tau [/itex] is the relaxation time and [itex] m [/itex] mass of the electron. From here you should be able to find the resistivity.
     
  4. Aug 16, 2011 #3
    i did the calculation, i got: 1.6e-3 Ohmm is that correct, or am i missing something.
    thanks for quick reply
     
  5. Aug 16, 2011 #4
    If we used the same metal (copper) in hall probe to measure the magnetic field, how can i calculate the hall coeficient of copper and the magnetic field acting on copper.

    thickness 100um
    hall voltage 0.1uV
    current 1.5 A
     
  6. Aug 16, 2011 #5
    i am a bit confused, is there a reason why the molar mass isn't in the equation?
     
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