In a series \( L-R \) growth circuit, if maximum current and maximum induced emf in an inductor ...

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In a series \( L-R \) growth circuit, if maximum current and maximum induced emf in an inductor of inductance \( 3 \mathrm{mH} \) are \( 2 \mathrm{~A} \) and \( 6 \mathrm{~V} \) respectively, then the time constant of the circuit is:
(a) \( 1 \mathrm{~ms} \).
(b) \( 1 / 3 \mathrm{~ms} \).
(c) \( 1 / 6 \mathrm{~ms} \)
(d) \( 1 / 2 \mathrm{~ms} \)
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