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Operational Amplifiers

Q1:

If ground is applied to the (+) terminal of an inverting op-amp, the (–) terminal will:

A not need an input resistor

B be virtual ground

C have high reverse current

D not invert the signal

ANS:B - be virtual ground

In inverting amplifier, When the positive terminal is connected to ground, then the voltage (potential) between inverting and non inverting terminal is zero. So inverting input terminal should be virtual ground.



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