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Bars of square and circular cross-section with $0.5\: m$ length are made of a material with shear strength of $20\: MPa$. The square bar cross-section dimension is $4\:cm \times$ $4\:cm$ and the cylindrical bar cross-section diameter is $4 \:cm$. The specimens are loaded as shown in the figure.

Which specimen(s) will fail due to the applied load as per maximum shear stress theory?

  1. Tensile and compressive load specimens
  2. Torsional load specimen
  3. Bending load specimen
  4. None of the specimens
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