Question

An op-amp has an offset voltage of 1 mV and is ideal in all other respects. If this op-amp is used in the circuit shown in figure below, the output voltage will be (select the nearest value):

• A. 1 mV
• B. 1 V
• C. $\pm$1 V
• D. $\pm$5 V

Hint:

For an ideal op-amp with offset voltage, the output voltage will be affected by the offset and gain of the circuit. Always consider the offset voltage when analyzing the output.

Answer 1

The Correct Option is C

In an ideal operational amplifier (op-amp), the output voltage is determined by the difference in the input voltages, multiplied by the gain. However, the op-amp in this case has an offset voltage of 1 mV.
Given the offset voltage, the output will be directly proportional to this offset and the gain set by the feedback network. In this case, the op-amp is ideal in all respects other than the offset voltage, and this will result in an output voltage of approximately $\pm$1 V.
Thus, the output voltage is closest to $\pm$1 V.