AP and TS EAMCET Engineering Model Paper 8

A copper wire and a steel wire of radii in the ratio 1 : 2, lengths in the ratio 2 : 1 are stretched by the same force. If the young's modulus of copper and steel are 1.1 × 10‌11Nm‌−2 and 2 × 10‌11 Nm‌−2 respectively, then the ratio of their extension is