Discussion
A resistance is quoted as 15.000 \( \Omega \) at 20 \( ^\circ \)C. Reporting a bridge measurement of it to five figures without recording the temperature is
Answer: A
A single degree changes a copper resistance in the fourth significant figure, so a five-figure value without a temperature is not a statement about anything. Standards are made of manganin precisely because its coefficient is small, but the specimen under test usually is not.
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