A string A of length 0.314 m of Young's modulus 
is connected to another string B of length and Young's modulus both twice of those of A. This series combination of strings is then suspended from a rigid support and its free end is fixed to a load of mass 0.8 kg . The net change in length of the combination is 
mm . (radius of both the strings is 0.2 mm and acceleration due to gravity 
)
(Mass of both strings is to be neglected as compared to the mass of load)
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