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In the circuit shown below, what is the output voltage (Vout) if a silicon transistor Q and an ideal op-amp are used?

1. −15 V
2. −0.7 V
3. +0.7 V
4. +15 V

Correct answer: −0.7 V

Solution

The output voltage is −0.7 V because a silicon transistor typically has a base-emitter voltage drop of approximately 0.7 V when it is in the active region, which is reflected in the output of the circuit.

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