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Two straight thin bars, one of brass and...

Two straight thin bars, one of brass and the other of steel are joined togethre side by side by short steel cross-pieces at `0^(@)C`, one cm long the centre lines of the bars being one cm apart. When heated to `100^(@)C`, the composite bar becomes bent into the arc of a circle. calculate the radius of this circle.
`alpha` for brass `=19xx10^(-6)` per `.^(@)C`
and `alpha` for steel `=11xx10^(-6)` per `.^(@)C`

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