Why does a galvanometer show a momentary deflection at the time of charging or discharging a capacitor? Write the necessary a expression to explain this obervation.

Explanation

Yes, the ammeter show a momentary deflection during the process of charging of capacitor by connecting it across a d.c. source along with an ammeter. This deflection is due to a conduction current `I=(dq)/(dt)` is flowing through the connecting wries. Between the plates a capacitor a displacement current `I_(D)=in_(0)(dphi_(E))/(dt)`, where `(dphi_(E))/(dt)` is the rate of change of electric flux inside the capacitor.