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This question is asked to find the value of \$V_o\$ in terms of \$V_s\$ that i already got so don't want solution for this.

I have one doubt,while applying nodal I applied nodal at the ground terminal (that red line pointing) too that gives me incorrect answer. that i did't understand why can't I apply nodal at that point?

what i understand is if I give that three branch separate ground then that will not be a node anymore.

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The problem with performing KCL at the reference node shown in the diagram is that that node only tells part of the story: there is an implied current return path to the amplifier that the reference node is not accounting for, and there is current from the output of the amplifier flowing into that shown reference node (through the feedback resistor and "beyond").

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  • \$\begingroup\$ Thanks... It seems I need to learn some basics of Opamp. \$\endgroup\$ – Rohit Oct 15 '17 at 17:51

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