Find the voltage VN for the circuit shown below? [Figure description: An op-amp circuit. A 40 kΩ resistor is connected from ground to node V1, which connects to the inverting (-) input; a 6 V source (polarity marked - + ) is connected between node V1 and the op-amp output V0. The non-inverting (+) input node VN is connected to ground through a 10 kΩ resistor and to the output V0 through a 20 kΩ resistor.]
- A. 6 V
- B. 4 V
- C. 5 V
- D. 3 V