No it's not from my textbook. İt's from my notes. And I think the diagram it's not correct. I set the oscilloscope to 5V, but the result is different from square wave?The reason you see a straight line on the B channel is you have the oscilloscope set for 500V/DIV. I would hope you saw a straight line.
Is the diagram in your post number 1 the correct diagram from your textbook or exam book? While the members here would jump on the improper polarity of V2, that may be exactly what the instructor wanted.
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