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## Homework Statement

An inductor is connected in series with a 1000 ohm resistor and a battery. What mus be the inductance in millihenries of the inductor if the current in the circuit is required to reach 90% of its final value after 20 microseconds?

## Homework Equations

I am not actually sure which equatins to use. All I know is E(naught) - L(dI/dt) = IR

## The Attempt at a Solution

First I tried to just plug in the numbers but I am obviously missing some values. Another equation I was given was I = (E/R) (1- exp(-t/(L/R))