Answer Posted / vivek

opamp gain is is very high about greater than 1000
so according to formula gain A=Vo/Vi, Vo=A*Vi, Vo=1000*Vi,
so if we apply small voltage of .025V, we get o/p volatage
Vo=1000*.025=25V, so due to high gain we need very small
or negligible amount of i/p voltage or current. so we
ground the one port at i/p side it means no current flows
through it but practically it always has some value in the
fraction of ampere.

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