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Q.

The graph shown the extension of wire of length 1 m suspended from the top of a roof at one end and with a load W connected to the other end. If the cross sectional area of the wire is 1 mm2 , then the Young's modulus of the material of the wire is

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a

2×1011Nm-2

b

2×1010 Nm-2

c

12×1011Nm-2

d

none of these

answer is B.

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Detailed Solution

Y =FLeA=100×15×10-3×10-6=2×1010 Nm-2
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The graph shown the extension of wire of length 1 m suspended from the top of a roof at one end and with a load W connected to the other end. If the cross sectional area of the wire is 1 mm2 , then the Young's modulus of the material of the wire is