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## Homework Statement

## Homework Equations

; 3. The Attempt at a Solution [/B]Here is my thought process and assumptions.

Without V

_{s1}and R2, the open-circuit current would be V

_{s2}/R2, but I know V

_{s1}and R1 must be contributing in some way. I'm thinking of summing the Voltage sources and using the Potential divider to find V

_{open-circuit}. Can I do that?

I also assume we are calculating the open-circuit current and voltage after transforming into the Thevenin equivalent, not before (is this correct?), even though we are taking the circuit separately and an open-circuit is formed.

I know the time constant = RC, since after the Thevenin equivalent, we have RC circuit, driven by V

_{Thevenin}.