A emf of 10V is applied in a circuit containing inductance L and resistance R. $L=5H$ and $R= 10 \;\Omega$ . The ratio of current at $t =\infty$ and $t= 1\;s$ in

Question

$(a)\;\frac{1}{e^2-1} \\ (b)\;\frac{e^2}{e^2-1} \\(c)\;\frac{1}{1-e^2} \\(d)\;e^2$