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Homework Help: Current in a hollow tube problem

  1. Mar 7, 2010 #1
    1. A 60.0 -cm-long hollow nichrome tube of inner diameter 1.10 mm, outer diameter 4.20 mm is connected to a 3.00 V battery. What is the current in the tube?


    2. Relevant equations
    Resistivity for nichrome = 1.5*10^-6 ohm meters
    I=V/R
    E=V/L


    3. The attempt at a solution
     
  2. jcsd
  3. Mar 8, 2010 #2
    I don't know what parts you are having trouble with, but before you can use the equations you posted you have to find the Resistance with the formula R=rho*L/A your A will be pi*(outer radius - inner radius)^2. Then you can proceed.
     
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