Part A

In $($Figure $1),R=13\mathrm{.}0$ and the battery emf is $6\mathrm{.}30V.$

With switch $S_2$ open, switch $S_1$ is closed. After several

minutes, $S_1$ is opened and $S_2$ is closed.

At $2\mathrm{.}20ms$ after $S_1$ is opened, the current has decayed to $0\mathrm{.}240A.$ Calculate the inductance of the coil.

Express your answer with the appropriate units.

$L=$

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Part B

How long after $S_1$ is opened will the current reach $1\mathrm{.}00\%$ of its original value?

Express your answer with the appropriate units.

$t=[,]$