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A cylinder of diameter exactly "1cm" at ...

A cylinder of diameter exactly "1cm" at `30^(@)`C is to be inserted into a hole in a steel plate. The hole has a diameter of 0.99967cm at `30^(@)`C .If `alpha` for steel is `1.1times10^(-5)``/^(@)`C," to what temperature must the plate be heated

1) `40^(@)`C

2) `50^(@)`C

3) `60^(@)`C

4) `70^(@)`C

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