The current through the inductor is given by:
$$i(t) = I_f + (I_0 - I_f)e^{-t/\tau}$$
where:
* $I_f$ is the final current, which is the current when the inductor is fully charged.
* $I_0$ is the initial current, which is the current at t=0.
* $\tau$ is the time
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