Capacitance Formula

Capacitance Formula

A material thing or device’s capacitance is its ability to hold an electric charge. The ratio of those two values is used to calculate the change in charge in response to an alteration in electric potential. Two concepts of capacitance that are widely understood are self-capacitance and mutual capacitance. Self-capacitance is a property of electrically chargeable objects that can be observed by measuring the electric potential between the charged object and the ground. Mutual capacitance is a property of two components that can be measured, and it plays a crucial role in the operation of the capacitor, an elemental linear electronic component made specifically for this use. To measure capacitance, it is important to use the Capacitance Formula. The geometry of the capacitor’s design, such as the opposing surface areas of the plates and their spacing, and the permittivity of the dielectric material between the plates, are the sole factors that affect capacitance. The permittivity and thus the capacitance for many dielectric materials are independent of the overall charge on the conductors as well as the potential difference between them.


Capacitance is typically used as a colloquial term when referring to the mutual capacitance between two adjacent conductors, such as the two capacitor plates. Every isolated conductor does, however, also display self-capacitance, a type of capacitance. It is determined by how much additional electric charge is required to elevate the electric potential of an isolated conductor by one unit of measurement, such as one volt. To determine capacitance, the Capacitance Formula is used. A hypothetical hollow conducting sphere with an unlimited radius serves as the potential’s reference point, with the conductor centred inside the sphere.

Capacitance Formula

Self-capacitance is occasionally used to refer to the inter-winding capacitance of a coil, although this is a separate phenomenon. It is essentially a type of stray or parasitic capacitance that exists between each of the coil’s individual turns. At high frequencies, this self-capacitance is a crucial factor to take into account because it affects the coil’s impedance and results in parallel resonance. This undesired consequence places a higher frequency limit on the circuit’s ability to operate properly in many applications. It is an electric component that is essentially found in all electronic devices. Moreover, a capacitor of some form is present in every electronic piece of equipment. Additionally, capacitors store charge (electrical charge) inside of them until they are full, at which point they burst with it. Additionally, the capacitor aids in the device’s ability to store charge, which enables it to survive without external power and finish the recovery process. Moreover, a circuit is required to receive a consistent “pulse” of energy every x seconds. Additionally, capacitors are available in a wide range of sizes and can store energy in amounts ranging from very little to very much.

Derivation of the Formula

It is necessary to pay attention to the derivation of the Capacitance Formula. Students are advised to focus on each point related to the derivation of the Capacitance Formula. There are numerous practice questions about the Capacitance Formula that students must solve.


Learning and revision of the Capacitance Formula derivation are crucial for students to practice questions. All the exercise questions specific to the Capacitance Formula can be practised well with the help of NCERT solutions provided by Extramarks.

Solved Example on Capacitance Formula

Some questions about the Capacitance Formula can be difficult to solve. It is necessary for students to refer to the NCERT solutions in order to get appropriate answers to questions related to Capacitance Formula. The purpose of practising questions is to help students retain the Capacitance Formula for a long period of time in their memory. All the important topics covered in the subjects need to be revised again and again. Proper revision of chapters is necessary for scoring well in the examinations. Students having problems in any subject should take assistance from the educators at Extramarks. All the topics that carry higher weight must be revised more.

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