Question
A steel scale measures the length of a copper rod as L cm when both are at 20^{o}C, the calibration temperature for the scale. If the coefficient of linear expansion for steel and copper are respectively, what would be the scale reading (in cm) when both are at 21^{o}C?




L
easy
Solution
The length of 1 cm division of the steel scale at is
Length of copper rod at will be
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