What is the output voltage Vo of the OPAMP circuit given below?

enter image description here

Attempt at solution: THE ANSWER IS GIVEN: 6V, but according to me as the positive terminal is grounded the negative terminal will be virtually grounded (0V), from ohm's law (applying to the two series resistance) it is expected that Vo is 0V!

I don't know where I am getting wrong!

  • 1
    \$\begingroup\$ OMG where did that circuit come from? \$\endgroup\$
    – user16324
    Commented May 25, 2021 at 12:52

3 Answers 3



And that answer is wrong. As drawn, the + input of the opmap is grounded

The voltages 1V, 2V, 3V do nothing.

The rest of the circuit will have as solution \$V_O\$ = 0 V as that is the only valid solution for such a feedback circuit.

So as Tony suggests:

  • the answer is wrong


  • the circuit has been drawn in the wrong way.

You're not wrong!

The question and/or answer are wrong!

Kudos to you for spotting that.


Either it’s a dumb drawing or a trick question.

Disconnect erroneous gnd on Vin+ and recompute.


The drawing is wrong. No GND on the non inverting input.


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