(b) $\frac{L_{2}}{L_{1}} = \frac{N_{2}^{2}}{N_{1}^{2}}$ $\therefore\ \ L_{2} = L_{1}\frac{N_{2}^{2}}{N_{1}^{2}} = 1.5\ \left( \frac{500}{100} \right)^{2} = 375\ $mH
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.