A steel scale measures the length of a copper wire as \[80.0\,cm,\] when both are at \[20{}^\circ C\] (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at \[40{}^\circ C\]? (Given asteel \[=11\times {{10}^{-6}}\]per°C and acopper \[=17\times {{10}^{-6}}per\,{}^\circ C\]) [CPMT 2004]

\[\frac{1}{\sqrt{2}}\,\,m\text{/}{{s}^{\text{2}}}\] toward north-east

A steel scale measures the length of a copper wire as \[80.0\,cm,\] wh

1.	A steel scale measures the length of a copper wire as \[80.0\,cm,\] when both are at \[20{}^\circ C\] (the calibration temperature for scale). What would be the scale read for the length of the wire when both are at \[40{}^\circ C\]? (Given asteel \[=11\times {{10}^{-6}}\]per°C and acopper \[=17\times {{10}^{-6}}per\,{}^\circ C\]) [CPMT 2004]
A.	\[80.0096\,cm\]
B.	\[80.0272\,cm\]
C.	\[\frac{1}{\sqrt{2}}\,\,m\text{/}{{s}^{\text{2}}}\] toward north-east
D.	\[25.2\,cm\]
Answer» B. \[80.0272\,cm\]

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