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Finding voltages at opamp terminals from circuits

FIGURE 1 shows two amplifier circuits, each of which has one unknown
voltage (shown highlighted).Assume that
the op-amps are ideal and that the magnitude of their output voltages is
less than their maximum peak output voltage swing (VOM).

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Solution Summary

This solution shows how one can determine the input potentials at opamp terminals by considering Ideal OpAmp conditions and circuit topology, including kirchoffs current law, potential divider law and virtual earths

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