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An e.m.f. of 15 volt is applied in a circuit containing 5 henry inductance and 10 ohm resistance. The ratio of the currents at time t = ∞ and at t = 1 second is

(1) $\frac{{e}^{1/2}}{{e}^{1/2}-1}$

(2) $\frac{{e}^{2}}{{e}^{2}-1}$

(3) 1 – e–1

(4) e–1