A steel scale measures the length of a c...

A steel scale measures the length of a copper rod as `l_(0)` when both are at `20^(@)C`, which is the calibration temperature for the scale . The scale reading when both are at `40^(@)C`, is :-

`L((1+alpha_(c)))/((1+alpha_(s)))`

`L(alpha_(c))/(alpha_(s))`

`L(alpha_(s))/(alpha_(c))`

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