Operational amplifier is a

In the circuit shown in the diagram, the operational amplifier may be assumed to be ideal. The current in the 12 kOmega resistor is I . What is the current I_(f) in the 72 k Omega resistor?

State use of Wheatstone's bridge along with operational amplifier

An input voltage V_(i) of 0.20 V is applied to an operational amplifier connected as shown in the diagram. What is the output voltage V_(0) ?

In a p-n-p transistor operating as amplifier with common emitter configurations a change in base current from 100 muA to 200 muA produces to change in collector current grain of transistor