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The Young's modulus of a rubber string 8 cm long and density 1.5 kg/m3 is 5×108 N/m2, is suspended on the ceiling in a room. The increase in length due to its own weight will be

(a) 9.6×10-5 m                           (b) 9.6×10-11m

(c) 9.6×10-3 m                           (d) 9.6 m