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Op Amp Virtual Earth
Explanation: Operational amplifiers have a very large open loop gain. So if the output is a few volts, the inverting input voltage must be very small (a few microvolts). This voltage is so small, it is called a virtual earth.
The inverting input, labelled "VE" on the simulation below, is a Virtual Earth because the voltage here is approximately zero as long as the amplifier is not saturating or limiting.
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