# If the input voltage vi = 5 V, the output voltage vo is:

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MPPKVVCL Indore JE Electrical 21 August 2018 Official Paper
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1. −2 V
2. 2 V
3. −12.5 V
4. 12.5 V

Option 3 : −12.5 V
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## Detailed Solution

Concept

For an ideal OP-AMP, the voltage at inverting and non-inverting terminal are equal by the virtual ground concept.

Note: If nothing is given about the OP-AMP, then by default it is an ideal OP-AMP.

Calculation

The voltage at the non-inverting terminal is 0 V

∴ By the concept of the virtual ground concept, the voltage at inverting terminal (Vx) is:

Vx = 0 V

Applying KCL at inverting terminal, we get:

$${V_x-V_i\over 10}+{V_x-V_o\over 25}=0$$

$${0-5\over 10}+{0-V_o\over 25}=0$$

Vo = −12.5 V
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