Question
The current in the $R L$ circuit shown here increases to $40 \%$ of its steady-state value in $2.0 \mathrm{s}$. What is the time constant of the circuit?
Step 1
Step 1: The formula for current in an RL circuit at time $t$ is given by: \[I(t) = \frac{EMF}{R}(1 - e^{-t/\tau})\] where $\tau$ is the time constant of the circuit, $EMF$ is the electromotive force, and $R$ is the resistance. Show more…
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