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