Resistivity and Temperature: The temperature coefficient of resistivity of platinum is 3.9 × 10-3/C°. If a platinum wire has a resistance of R at a temperature of 23°C, to what temperature must it be heated in order to double its resistance to 2R?
A. 280°C
B. 300°C
C. 730°C
D. 930°C
Answer: A
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