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Given Op-amp is ideal. Calculate vo if va=1v and vb=0v.

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Given Op-amp is ideal. Calculate vo if va=1v and vb=0v.

(a) -4v

(b) -2.5v

(c) 4v

(d) 2.5v

The question was asked during an online exam.

The query is from Operational Amplifier Terminals,Terminal Voltages and Currents topic in portion The Operational Amplifier of Electric Circuits

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The correct option is (b) -2.5v

To explain I would say: In the given circuit, a negative feedback exists between Op-amp’s output and its inverting input (voltage here is 0, as vp =vb=0 and vn=vp). Node-voltage equation is i50=i125=i0.

 i50= (va-vn)/50 =1/50 mA.

 I125= (v0-vn)/125 = v0/125 mA.

 1/50 + v0/125 = 0.

v0 is -2.5volts.

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