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    Okay, so my coursework for physics is about the resistivity of different wires; I have to decipher which of the following materials the tested wire is made from: Copper, Nichrome and Constantan; the practical itself is quite self-explanatory, however I have been told that I need three different case studies from different sources; eg. only one can be sourced from the internet. Does anyone have any examples or advice on finding a relevant case study, and what to write about each one of them? Thanks
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