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                                    4. A steel wire and a copper wire of equal length and equalcross-sectional area are joined end to end and thecombination is subjected to a tension. Find the ratio of(a) the stresses developed in the two wires and (b) thestrains developed. Y of steel = 2 × 10 11 N m-t Y of copper-1.3 x 10 11 N m2 | 
                            
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