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A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The minimum normal stress will be

400 MPa
500 MPa
900 MPa
1400 MPa

Correct Answer: 400 MPa

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