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The current in a LR circuit builds up to \( 3 / 4^{\text {th }} \) of its
\( \mathrm{P} \) steady state value in \( 4 \mathrm{~s} \). The time constant of this circuit is
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(1) \( \frac{1}{\ln 2} s \)
(2) \( \frac{2}{\ln 2} s \)
(3) \( \frac{3}{\ln 2} s \)
(4) \( \frac{4}{\ln 2} s \)
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