An infinitesimal square element $\text{PQRS}$ is shown in the figure. The $x$ and $y$ axes are also marked in the figure. The strains on the element are given by
$\varepsilon_{x x}=500 \times 10^{-6}, \: \varepsilon_{y y}=100 \times 10^{-6} \text { and } \varepsilon_{x y}=0$
Which of the following statements is/are $\textsf{CORRECT}$?
- Percentage change in length of the diagonal $\text{PR}$ is $0.03$.
- Change in angle between $\text{PR}$ and $\text{QS}$ is $4 \times 10^{-4} \: \mathrm{rad}$.
- Change in angle between $\text{PR}$ and $\text{QS}$ is $2 \times 10^{-4} \: \mathrm{rad}$.
- Percentage change in length of the diagonal $\text{QS}$ is $0.03$.
