$2.(45$ points$)$ For the circuit in the figure, obtain the Thevenin equivalent circuit across the terminals of $\backslash ($ R$\_\{$L$\}\backslash )$ and answer:

a$.(15$ points$)$ Fill the values

b$.(15$ points$)$ Use the Thevenin equivalent circuit to find the current $\backslash ($ i$\_\{$L$\}\backslash )$ for the following values of $\backslash ($ R$\_\{$L$\}\backslash )($if this question is solved not using Thevenin, it will be graded over $\backslash (70\backslash \%\backslash )).$