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1

Just answering the question (title) - without reference to the presented diagram: Yes, of course, a resistance can be negative !! The I-V characteristic of a tunnel diode (Esaki diode) shows in a certain range a negative dynamic (differential) resistance (hence, not a static negative resistance) There are special active circuits (NIC- Negative Impedance ...


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Notice that you have a current source and not a voltage source. In this case, when using Thevenin you should replace the current source by an open circuit to find the equivalent resistance (as opposed to replace by a short if you have a voltage source). Therefore, the equivalent resistance will not be R1//R3 + R2 as you've assumed. Actually the solution is ...


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