In an \( L R \) circuit current at \( t=0 \) is \( 20 \mathrm{~A} \). After \( 2 \mathrm{~s} \) ...

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In an \( L R \) circuit current at \( t=0 \) is \( 20 \mathrm{~A} \). After \( 2 \mathrm{~s} \) it reduces to \( 18 \mathrm{~A} \). The time constant of the circuit is (in second):
(a) \( \ln \left(\frac{10}{9}\right) \)
(b) 2
(c) \( \frac{2}{\ln \left(\frac{10}{9}\right)} \)
(d) \( 2 \ln \left(\frac{10}{9}\right) \)
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