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The switch in the figure below was closed for a long time. It is opened at $t=0$. The current in the inductor of $2$H for $t \geq 0$, is 

  1. $2.5e^{-4t}$
  2. $5e^{-4t}$
  3. $2.5e^{-0.25t}$
  4. $5e^{-0.25t}$
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