29. An area of cross-section of rubber string is 2 cm
29. An area of cross-section of rubber string is 2 cm2 . Its length is doubled when stretched with a linear force of 2×105dynes. The Young’s modulus of the rubber in dyne/cm2 will be
(a) 4×105 (b) 1×105
(c) 2×105 (d) 4×104
Answer-B
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a