Correct Answer: Option C

Explanation

Stress = \(\frac{force}{area}\)

Force = weight = y\(^2\), Area = \(\pi\)r\(^2\), Diameter = \(\frac{\text{y}}{\pi}\)m ⇒ r = \(\frac{\text{y}}{2\pi}\)m

Stress = \(\frac{y^2}{\pi \times\frac{y^2}{(2\pi)^2}}\)

           = \(\frac{y^2}{\pi y^2} \times 4(\pi)^2\) = 4\(\pi\)Nm\(^{-2}\)

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