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7. The stress versus strain graphs for wires of two materials A and B are as shown in the figure.

The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If Y1 and Y2 are the Young ‘s modulii of the materials, then

(a)    YB = 2YA

(b)    YA =YB

(c)     YB =  3YA

(d)    YA = 3YB

Answer-d

(18)

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