28. Steel and copper wires of same length are stretched by the same weight one after the other. Young’s modulus of steel and copper are
28. Steel and copper wires of same length are stretched by the same weight one after the other. Young’s modulus of steel and copper are 2×1011 N/m2 and 1.2×1011 N/m2 . The ratio of increase in length
(a) 2/5 (b) 3/5
(c) 5/4 (d) 5/2
ANSWER-B
(9)
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a (123)