A steel scale measures the length of a copper wire as `80.0 cm` when both area at `20^(@)C` (the
Channel: Doubtnut
Date: 2020-01-19

A steel scale measures the length of a copper wire as `80.0 cm` when both area at `20^(@)C` (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at `40^(@)C`? (Given `alpha_(\"steel\") = 11 xx 10^(-6) per ^(@)C` and `alpha_(\"copper\") = 17 xx 10^(-6) per^(@)C`)