Capacitors and Capacitance
P = χ e E χ e – electric susceptibility of the dielectric medium
Capacitors and Capacitance
A capacitor is a system of two conductors separated by an insulator . o
o
o
The total charge of a capacitor is zero while the conductors have charge Q and – Q .
A single conductor can be considered as capacitor with other conductor at infinity .
Electric field in the region between the conductors is proportional to the charge Q .
o Capacitanceis denoted by , C = Q / V . It depends on : o
o
Geometrical configuration ( shape , size , separation ) of the system of two conductors .
Nature of insulator / dielectric separating o
Charge on the capacitor leaks away due to reduction in the insulating power of the intervening medium . This happens due to higher potential difference causing strong electric fields .