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Platinum wire resistance

by ibysaiyan
Tags: platinum, resistance, wire
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Oct2-11, 09:43 AM
P: 442
1. The problem statement, all variables and given/known data

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.
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Oct3-11, 02:32 PM
P: 442
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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