(b) $a_{1} = 5,\ a_{2} = 10 \Rightarrow \frac{I_{\max}}{I_{\min}} = \frac{\left( a_{1} + a_{2} \right)^{2}}{\left( a_{1} - a_{2} \right)^{2}} = \left( \frac{5 + 10}{5 - 10} \right)^{2} = \frac{9}{1}$
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.