English Medium Explanation | A/L Physics | Electric Field Question | Capacitance

English Medium Explanation | A/L Physics | Electric Field Question | Capacitance

Capacitance is the ability to store electrical energy. Almost all things, including you, can store some electrical energy and therefore have capacitance. When you rub your feet across a carpet, charged particles called electrons can be transferred from the carpet to you. The capacitance of a spherical conductor is directly proportional to its radius.

Spherical Capacitor is the capacitance for spherical or cylindrical conductors that can be obtained by evaluating the voltage difference between the conductors for a given charge on each. It is a kind of capacitor that has one or more thin hollow spherical plate/s conductors. Spherical capacitors can be of various types namely Isolated Spherical Capacitor, Concentric Spherical Capacitors with two spheres, etc. It depends then on the inner and outer radius of each sphere

The capacitance for spherical conductors can be obtained by evaluating the voltage difference between the conductors for a given charge on each. The capacitance of any sphere (C = 4πε0R), whether hollow or solid, will be the same if the surrounding medium is the same. Again, if the surrounding medium is air, then capacitance C = 4πε0R, where R = radius of the sphere. The above two spheres have an equal radius. So, their capacitances will be the same. If the applied potential is V, then a charge of each of the spheres will be Q = CV. So, in the two spheres, an equal amount of charge will remain.

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