In the circuit shown below, all the components are ideal. If V_{i} is +2 V, the current 10 sourced by the op-amp is _________mA.

GATE Electronics and Communications (EC) 2020 Solved Papers

Question : 27 of 65

Marks: +1, -0

In the circuit shown below, all the components are ideal. If

V_{i}

+2 V

, the current 10 sourced by the op-amp is _________mA.

Solution:

Applying virtual ground

{I}_{1}= {I}_{ {f}}

\;{2-0}/{1 {K}}=\;{ {V}_{ {o}}-2 {V}}/{1 {K}}

2 {mA}=\;{ {V}_{0}-2 {V}}/{1 {K}}

{V}_{0}=4 {V}

∴ {I}_{ {C}}=\;{ {V}_{ {O}}-0}/{1 {K}}=\;{4-0}/{1 {K}}=4 {mA}

∴ {I}_{0}= {I}_{ {L}}+ {I}_{ {f}}=4 {mA}+2 {mA}( ∵ {I}_{ {f}}= {I}_{1}=2 {mA})

=6 {mA}

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