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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > A steel scale measures the length of a copper wire as 80.0cm when both area at 20C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40C?

A steel scale measures the length of a copper wire as 80.0cm when both area at 20C (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at 40C?

At room temperature (25C) the length of a steel rod is measured using a brass centimetre scale. The measured length is 20 cm. If the scale is calibrated to read accurately at temperature 0C find the actual length of steel rod at room temperature.