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In the figure, the load $P=1 \: N$, length $L=1 \: m$, Young’s modulus $E=70 \: GPa$, and the cross-section of the links is a square with dimension $10 \: mm \times 10 \: mm$. All joints are pin joints.

The stress (in $Pa$) in the link $AB$ is ___________
(Indicate compressive stress by a negative sign and tensile stress by a positive sign.)

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