Physics - Practical physics Question with Solution | TestHub

$\frac{\text{x}}{90}=\frac{l_1}{l_2}=\frac{11}{91}$

$\text{x}=\frac{11}{91}\left(90\right)$

$\frac{{\text{x}}^{\prime }}{90}=\frac{10}{90}$

$\Rightarrow {\text{x}}^{\prime }=10$

$\Rightarrow \Delta \text{x}=\left(\frac{11}{91}\left(90\right)-10\right)$

$=\left(\frac{990-910}{91}\right)$

$=\frac{80}{91}$

$\Delta \text{x}\text{\%}=\frac{\Delta \text{x}}{\text{x}}\times 100=\frac{\frac{80}{91}}{\frac{990}{91}}\times 100$

$=\frac{800}{99}\text{\%}$

$=\text{ 8.1}\text{\%}$