-The op-amp in Figure has an input impedance of 5 MΩ. What is the input impedance of the circuit?
A) 5 MΩ
B) 10 kΩ
C) 50 MΩ
D) 110 kΩ

Question

-The op-amp in Figure has an input impedance of 5 MΩ. What is the input impedance of the circuit?
A) 5 MΩ 
B) 10 kΩ 
C) 50 MΩ 
D) 110 kΩ

Quizplus · Accepted Answer

The input impedance of the circuit is determined by the input impedance of the op-amp itself, as the external components (resistors, capacitors, etc.) in the feedback loop or input stage do not change the intrinsic input impedance of the op-amp. Therefore, if the op-amp has an input impedance of 5 MΩ, the input impedance of the entire circuit remains 5 MΩ.

-The Op-Amp in Figure Has an Input Impedance of 5