A couple Capacitor and Circuit Questions

[stester77s]

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Hello everyone, please refer to the picture but answer the question I wrote below - don't answer the actual question from the test.

Don't answer the question from the test, please answer this question below:

1) If there was a resistor instead of a capacitor in that spot, what would the voltage response between A and B be? (choose from choices a,b,c,d, as in the attached picture and explain).

 

[TheJourney]

I have no idea if this right, but this would be my reasoning:

So you put a resistor instead of a capacitor between A & B. Now you have two resistors in series the original resistor R and the new resistor R'. Adding a new resistor in series will cause the current in the circuit to decrease. This decreased current will be the same throughout the series circuit because there is only one path for it to follow. So the graph from A to B would be a horizontal line I think.

Also, out of curiosity is the answer to that question A?

 

[DrknoSDN]

Also going to say that I'm not sure but if I had to reason a guess.
If you had 2 resistors instead of a resistor/capacitor and the square wave was going between 0 to some positive value you would have graph B.
There would be a voltage drop between points A and B from the 2nd resistor but only when there is current. No current, no voltage.

If the square wave was positive/negative then the voltage difference would bounce between B and C.
I believe if you just had a resistor between A and B the graph of voltage drop would look identical to the source producing it.

 

[30somethingyearold]

@TheJourney: Yeap, the answer to the test question is A.

@stester77s: I agree with DrknoSDN, if there was a resistor instead of a capacitor the answer would be B. Does it matter if there is only one or two resistors, would it be a square voltage change in either case?