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A metal plate of area 1.2 m^(2) increase...

A metal plate of area `1.2 m^(2)` increases its area by `2.4 xx 10^(-4) m^(2)` when it is heated from `0^(@)C` to `100^(@) C`. The coefficient of cubical excpansion of the metal expressed in per `.^(@)C` is

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