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In the circuit shown, supply voltage = ±15v, Va= +3v , Vb= -4v , Vc= +5v, R= R1= 1kΩ and RF= 2kΩ.  741 op-amp has A=  2×10^5 and R1= 10kΩ. Determine the output voltage internal resistance of the circuit?

(a) Vo ≅3v , RiF=6.67MΩ

(b) Vo ≅3v , RiF= 7MΩ

(c) Vo ≅3v , RiF=9.2MΩ

(d) Vo ≅3v , RiF= 3.5MΩ

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The question is from Summing, Scaling & Averaging Amplifier topic in chapter Operational Amplifier Applications of Linear Integrated Circuits

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