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The switch in the figure has been open for a long time

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The switch in the figure has been open for a long time. It is closed at t = 0 sec.

A)After the switch has been closed for a long time, what is the current in the circuit? Call this current I_0.

B)Find an expression for the current I as a function of time. Write your expression in terms of I-0, R, and L.