The resistance of metals is often temperature dependent. the dependence is characterized by the temperature coefficient of resistance (tcr), which is related to temperature according to r=rref[1+tcr*(t-tref)] over limited temperature range. rref is the resistance at some temperature tref. if the tcr of a platinum wire is 0.00393/°c and its resistance is known to be 20.1 ω at 25°c, what is the temperature of the wire if its resistance is 19.5 ω?
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