After the capacitor has been disconnected a sheet of insulating plastic material is inserted between the plates completely filling the space between them. An air filled capacitor is charged then disconnected from the power supply and finally connected to a voltmeter. Capacitance And Dielectrics Ppt Download Why Does A Capacitor Block Dc But Pass Ac Quora Doc 126 B P S Xii Physics Iit Jee Advanced Study Package When capacitors are connected to the power supply it is charged but when power supply is removed it remains charged if the capacitors are not given any path to discharge but if a load is connected with it after the power supply is removed it starts discharging through that load. An air filled capacitor is charged then disconnected from the power supply . An air filled capacitor is charged then disconnected from the power supply and finally connected to