Capacitor

Short Description of Topic

Claimed by Jiwon Yom

This page is all about the Electric Field due to a Point Charge.

Electric Field

Electric Field of two uniformly charged disks: A Capacitor

The Electric Field of a Capacitor can be found by the formula:

Electric field near the center of a two-plate capacitor

[math]\displaystyle{ \ E=\frac{Q/A}{epilson_0} }[/math] One plate has charge [math]\displaystyle{ \ +Q }[/math] and other plate has charge [math]\displaystyle{ \ -Q }[/math]; each plate has area A; Direction is perpendicular to the plates. Assumption: separation between capacitor is very small compared to the area of a plate.

Fringe Field (just outside the plates near center of disk)

[math]\displaystyle{ \ E_{fringe}=\frac{Q/A}{2epilson_0}\frac{s}{R} \text{ s is the separation between plates; R is the radius of plate } }[/math]