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The length of a zinc rod and platinum ro...

The length of a zinc rod and platinum rod each equal to 50m at `0^(0)C`. Calculate the difference in lengths of the two rods at `60^(0)C` if `alpha` for zinc is `25xx10^(-6)" "^(0)C^(-1)` and for platinum is `9xx10^(-6)" "^(0)C^(-1)`.

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The correct Answer is:
48mm
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