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Q.

The adjacent graph shows the extension (∆I) of a wire of length 1m suspended from the top of a roof at one end with a load W connected to the other end. If the cross sectional area of the wire is 10-6m2, calculate the young's modulus of the material of the wire

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a

2×1011N/m2

b

2×10-13N/m2

c

2×10-11 N/m2

d

2×10-12N/m2

answer is A.

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Detailed Solution

From the graph, l = 10-4m, F = 20 N

       A = 10-6m2, L = 1 m

∴ Y = FLAl = 20×110-6×10-4 = 20×1010 = 2×1011N/m2

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