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A prismatic bar $\text{PQRST}$ is subjected to axial loads as shown in the figure. The segments having maximum and minimum axial stresses, respectively, are

  1. $\text{QR}$ and $\text{PQ}$
  2. $\text{ST}$ and $\text{PQ}$
  3. $\text{QR}$ and $\text{RS}$
  4. $\text{ST}$ and $\text{RS}$
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