E7G09 — Amateur Extra Class

Question diagram
E7G09 : What will be the output voltage of the circuit shown in Figure E7-3 if R1 is 1,000 ohms, RF is 10,000 ohms, and 0.23 volts DC is applied to the input?
A 0.23 volts
B 2.3 volts
C -0.23 volts
D -2.3 volts
Correct Answer: -2.3 volts