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schematic

simulate this circuit – Schematic created using CircuitLab

The network 'N' contains only 2 elements. If the response for unit step excitation is i(t)= e^(-3t) A for t>=0. Determine elements and their connections?

What do I need to learn for cracking these types of problems.

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Laplace transforms and control theory would be a good start. And so you know the box contains a pure delay. For a 3rad/s signal.

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