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Two bars of different materials are of the same size and are subjected to same tensile forces. If the bars have unit elongations in the ratio of 4:7, then the ratio of modulus of 
elasticity of the two materials is 
A) 4:7 
B) 4:10 
C) 16:4 9

[SSC JE Civil 2017-18 (22 Jan Tech 1)]
A
B
C
D