An alumminium rod and steel wire of same length and cross-section are attached end to end. Then compound wire is hung fron a rig

An alumminium rod and steel wire of same length and cross-section are attached end to end. Then compound wire is hung fron a rigid support and load is suspended from the free end. Y for steel is `((20)/(7))` times of aluminium. The ratio of increase in length of steel wire to the aluminium wire is
A. `7:10`
B. `20:7`
C. `10:7`
D. `7:20`

An alumminium rod and steel wire of same length and cross-section are attached end to end. Then compound wire is hung fron a rigid support and load is

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