Physics - EMI/AC Question with Solution | TestHub

Initial current $\left({\mathrm{I}}_1\right)=10\mathrm{A}$; Final current $\left(I_2\right)=0$; Time $(t)=0.5\sec$ and induced e.m.f. $(\epsilon )=$ $220\mathrm{V}$. Induced e.m.f. ($\epsilon )$ $=-\mathrm{L}\frac{\mathrm{dI}}{\mathrm{dt}}=-\mathrm{L}\frac{\left({\mathrm{I}}_2-{\mathrm{I}}_1\right)}{\mathrm{t}}=-\mathrm{L}\frac{(0-10)}{0.5}=20\mathrm{L}$ or, $\mathrm{L}=\frac{220}{20}=11\mathrm{H}$ [where $\mathrm{L}=$ Self inductance of coil]