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A U-tube contains mercury, one of its li...

A U-tube contains mercury, one of its limbs is at `0^(@)C` and another is at `100^(@) C`. If the height of the column of mercury at lower temperature is `60` cm and that of column of mercury at higher temperature is `1.2` cm greater, calculate the coefficient of real expansion of mercury (in `10^(-4)` per `""^(@) C` )

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