GATE EC 2015 Set 2 — Question 50
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Network Theory → Transient & AC Analysis → Resonance in RLC Circuits
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Question
Assuming that the opamp in the circuit shown below is ideal, the output voltage (in volts) is ______.
Correct answer
11 to 12
Solution
In the figure the inverting-input node is tied directly to ground, so regardless of the output. The feedback resistor () only draws current from the output into ground; it cannot change , so there is no effective negative feedback.The non-inverting input is at . With and an ideal (infinite-gain) op-amp, the output is driven to the positive rail:(a practical op-amp saturates slightly below the supply, hence the accepted range).Answer: (accepted range 11 to 12)
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