Q.

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

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a

25

b

35

c

54

d

52

answer is B.

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Detailed Solution

l=FLAY⇒lSlcu=YcuYS(F__L_ and Y are constant )∴lslcu=1.2×10112×1011=35

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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