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.