Field and voltage of a moveable plate capacitor
parallel plate capacitor is built so the distance between the plates may be varied. Once the capacitor is charged, the field is essentially constant between the plates. One can then show that the voltage is proportional to the distance between the plates.
|Parallel plate capacitor||021-8C|
|rubber rod and cat's fur||in box on 021-13A|
|acrylic rod and silk|