Suppose an input voltage changes from 0 to V volts during which a capacitor gets charged fully.Now if the potential is kept constant will the capacitor start discharging or will the charge inside the capacitor remain constant?

Remember that the current through a capacitor is a function of the rate of change of voltage across it:



You can see that if you keep the voltage constant, current flow is 0.

Even if a resistor is connected to it??

Quote:

---

Originally Posted by Cho

even if a resistor is connected to it???

---

Yep, as long as the voltage across the cap is constant. If that resistor is in parallel with the capacitor you'll get current through the resistor (I = V/R), but not through the capacitor. If the resistor is in series with the cap then there's no current flow - unless the voltage is made to vary.