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Q.

The restoring force - strain graph is shown below for the same material. The thinnest wire is

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a

Z

b

X, Y, Z same thickness

c

X

d

Y

answer is C.

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Detailed Solution

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Slope $= \tan θ = \frac{Re s t o r i n g f o r c e}{S t r a i n} = Y \times A = Y π r^{2}$

Y=Young’s modulus same

r=radius

$θ ↓ \tan θ ↓ r ↓$ for ‘Z’ wire

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