An emf of 20 V is applied at time $t = 0$ to a circuit containing in series 10 mH inductor and $5 \Omega$ resistor. The ratio of the currents at time $t = \infty$ and at $t = 40 \mathrm {~s}$ is close to: (Take $e ^ { 2 } = 7.389$)\\
(1) 1.06\\
(2) 1.15\\
(3) 1.46\\
(4) 0.84