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A steel wire AB of length 85cm at 10^(@)...

A steel wire `AB` of length `85cm` at `10^(@)C` is fixed rigidly at points `A` and `B` in an aluminium frame as shown. If the temperature of the system is raised to `110^(@)C` , what extra stress will be produced in the wire relative to aluminium frame. Assume that coefficient of linear expansion for aluminium and steel are `23xx10^(-6)//^(@)C` and `11xx10^(-6)//^(@)C` respectively and Young's moduls for steel is `2xx10^(11)` pa.

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