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Q.

The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If Y_A and Y_B are the Young's modulii of the materials, then

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a

Y_B = 2Y_A

b

Y_B = 3Y_A

c

Y_A = Y_B

d

Y_A = 3Y_B

answer is D.

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Detailed Solution

$Slope of the stress strain curve is the Young' s modulus$

$\frac{Y_{A}}{Y_{B}} = \frac{T a n 60^{0}}{T a n 30^{0}} = 3 : 1$

$Y_{A} = 3 Y_{B}$

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