A copper rod ( = 1.70 10-5 C -1 ) is 20 cm longer than an
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A copper rod (α = 1.70 × 10-5 °C-1) is 20 cm longer than an aluminum rod (α = 2.20 × 10-5 °C-1). How long should the copper rod be if the difference in their lengths is to be independent of temperature?
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