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A copper rod of 88 cm and an aluminium r...

A copper rod of 88 cm and an aluminium rod af unknown length have their increase in length independent of increase in temperature. The length of aluminum rod is `(a_(cu) = 1.7 xx 10^-5 K^-1` and `alpha_(Al)=2.2 xx 10^-5 K^-1)`

A

88 cm

B

68 cm

C

6.8 cm

D

113.9 cm

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