Current Attempt in Progress

The switch in the figure is closed on $a$ at time $t=0.$ What is the ratio $\frac{E_L}{E}(a)$ just after $t=0$ and $($b$)$ at $t=1\mathrm{.}92T_L?($c$)$ At what multiple of $T_L$ will $\frac{E_L}{E}=0\mathrm{.}500?$

The switch in the figure is closed on $a$ at time $t=0.$ What is the ratio $\frac{E_L}{E}($a$)$ just after $t=0$ and $($b$)$ at $t=1\mathrm{.}92T_L?($c$)$ At what multiple of $T_L$ will $\frac{E_L}{E}=0\mathrm{.}500?$