Question: In the circuit, switch S is opened at t = 0 after having been closed for a long time. (a) How much energy is stored

In the circuit, switch S is opened at t = 0 after having been closed for a long time.
(a) How much energy is stored in the inductor at t = 0?
(b) What is the instantaneous rate of change of the inductor's energy at t = 0?
(c) What is the average rate of change of the inductor's energy between t = 0.0 and t = 1.0 s?
(d) How long does it take for the current in the inductor to reach 0.0010 times its initial value?

12 6.0 18 2 0.30

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