# Operational Amplifier Circuit

I am given this circuit

The voltage at each inverting ends should be 0, since the non-inverting ends are grounded. However, given that VIN is positive, there's a current flowing between each of the non-inverting ends (through the capacitor and resistor: hence to me it's equivalent to saying that the voltage through a series capacitor-resistor circuit is 0 even though there's current through both components). How can this be the case?

• What inductor???? – Andy aka Dec 28 '16 at 11:22
• @Andyaka sorry capacitor and resistor, not capacitor and inductor. – The First StyleBender Dec 28 '16 at 11:23
• You're right, a certain Vin will cause a current Vin/R to flow into the Vin node. It cannot flow into the opamp's input. So the opamp has to do something to make that current flow. You seem to have a problem with the current flowing through a capacitor. But is the current through a cap always zero ? Think about what happens if you charge a capacitor. What can the opamp do to make that capacitor charge ??? – Bimpelrekkie Dec 28 '16 at 11:28
• @FakeMoustache When the capacitor charges up, will the voltage between the capacitor and the inductor (i.e. the output of the op-amp on the left hand side) be negative? – The First StyleBender Dec 28 '16 at 11:34
• You keep mentioning inductor, now what are you talking about? Also what does this mean "there's a current flowing between each of the non-inverting ends"? – Andy aka Dec 28 '16 at 11:41