When an ideal capacitor is fully charged by a d.c. battery, the electric field E between the plates of capacitor does not change with time. Therefore, displacement current is zero. when an a.c. source is applied between the plates of an ideal capacitor, the electric charge on plates and consequently electric field E between the plates of capacitor is continuosly changing with time. Consequently a displacement current is set up and we say that a current is flowing through the capacitor.
Class 12 Physics Chapter 8 Electromagnetic Waves Session 2024-2025.
When an ideal capacitor is charged by a d.c. battery, no current flows. However, when an a.c. source is used, the current flows continuously. How does one explain this, based on the cancept of displacement current?
Share
When an AC source is connected, the changing electric field in the capacitor creates a varying electric flux between its plates. This variation generates a displacement current, which bridges the gap between the plates, complementing the conduction current in the circuit. Thus, current flows continuously in an AC circuit, despite the physical gap in the capacitor.
For more visit here:
https://www.tiwariacademy.com/ncert-solutions/class-12/physics/chapter-8/