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Homework Help: Platinum wire resistance

  1. Oct 2, 2011 #1
    1. The problem statement, all variables and given/known data


    154818o.png
    2. Relevant equations

    [itex]\Delta R[/itex]/ R0 = [itex]\alpha[/itex] [itex]\Delta T[/itex]
    which goes down to : r-r0 /r0 = alpha (T-T0)
    r/r0 = alpha T +1
    3. The attempt at the solution

    Hi there, I'm on a verge of mental breakdown. I have spent over 2 a4- sheets on figuring out how to get 't'.

    I have found out the value r/ro... however the part to find 't' has been daunting... I am aware of the expression within the bracket being a quadratic equation,hence two solutions of 't'... but what becomes of the value of r/r0 ?

    Thanks for your help in advance.
     
  2. jcsd
  3. Oct 3, 2011 #2
    Although I have sent my work to be marked but can anyone tell me how I should have proceeded with this question ? Thanks
     
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