PHYSICS CAPACITOR

Capacitance is an inherent property of an object. That is to say, any object, as long as it can hold static charges, possesses a capacitance. In fact, capacitance is a physical quantity used to measure how much charges that an object can hold. Therefore, a sphere, a ball, a piece of paper, a plastic ruler etc, all of them do possess capacitance.

A parallel plate arrangement is only a specific form of capacitor.

With the above understanding, it is apparent that when the two plates are separated wide apart such that they have no influence on one another, the capacitance of each of them would then be changed to that of a single plate. The capacitance formula, capacitance = charge/potential, still applies to a single plate capacitor.

至於電容呢個問題, 唔一定係plate, 就算一個天一個地既距離, 都會充電, 譬如雷電, 只要電壓夠高就可以充電, 兩條平行既電纜都會充電, 都有電容。

如果距離係無限遠, 就算係太陽系内的天王星、海王星，冥王星 Uranus, Neptune, Pluto 都有距離，From Earth 5900000000km