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## Homework Statement

http://i.imgur.com/wjD8Y.png

In the circuit below, V = 6 volts, R = 10 ohms, L = 100 mH. The switch has been open for a long time. Then, at time t = 0, the switch is closed.

What is the time constant for the current through the inductor?

**2L / R**

## Homework Equations

TAU=l/R

## The Attempt at a Solution

I am not sure how do I find the equvialent resistance in this case.

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