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A copper rod of 2cm diameter is completely encased in a steel tube of inner diameter 2 cm and outer diameter 4cm. Under an axial load, the stress in the steel tube is 100 N/mm2. If  $E_{s}=2E_{C}$ then the stress in the copper rod is                                                    

         (a) 50 N/mm2         (b)33.33 N/mm2

         (c)100 N/mm2        (d)300 N/mm2         

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