I need to find the equivalent resistance of the circuit here in order to find time constant. I know that I should replace current source with open circuit, then we have this:
That 1k Ohm confuses me. Is it serial or parallel to others? What about 2k and 3k ones? I assume that we should ignore the 1k and then 2k and 3k ones will be serial to each other. But I'm not sure. Can you tell me about how to determine the equivalent resistance of circuits with capacitors in general?
Note: I do not know Thevenin or superposition or such. I know the Nodal analysis method. Please do not include thevenin in your answers.