Questions

A copper rod of length 88 cm and an aluminium rod of unknown length have same increase in length at same increase in temperature. The length of aluminium rod is
$\large ({\alpha _{Cu}} = 1.7 \times {10^{ - 5}}{K^{ - 1}}\,and\,{\alpha _{Al}} = 2.2 \times {10^{ - 5}}{K^{ - 1}})$

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88 cm

68 cm

6.8 cm

113.9 cm

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detailed solution

Correct option is B

Increase in length is given by

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