Answer / safi sara

since there are two input terminals in the inputside so the
resistance between the two input terminal is very very
high.so a negligible amount of current flows through op-amp
otherwise the current will be zero,then current only passes
through feedback resistance.hence the input terminal is
assumed to be virtual ground

Answer / selvam

it is like ground terminal rep by vg

Answer / 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.

Answer / kohila

the input resistance of the amplifier is very high so the current does'nt flow through the path.so the current will flow through the feedback path

Answer / mehran ahsan

the resistance b/w the two terminals of input

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