Two wire A and B are stretched by same f...

Two wire A and B are stretched by same force. If for A and B, `Y_A :Y_B= 1:2, r_A:r_B=` 3: 1 and `l_A:l_B`=4:1,then ratio of their extension`(Deltal_A)/(Deltal_B)`will be

`0.42569444444444`

`11:7`

`8:9`

`6:5`

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