Q. When does the op-amp said to operate in common-mode configuration?

A
When the input voltage are equal
B
When different voltage is applied to both input and terminal of an op-amp
C
When input voltage is equal to the output voltage
D
When same voltage is applied to both input terminal of an op-amp
Solution:

When the same input voltage is applied to both input terminal of an op-amp, the op-amp is said to be operating in a common mode configuration.

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