How much energy is stored in the electric field of a 50-μm-diameter cell with a 7.0-nm-thick cell wall whose dielectric constant is 9.0?

The capacitance of the capacitor will be or .

Explanation:

Given:

The diameter of the plates of the capacitor is .

The distance between the plates is .

The dielectric constant of the medium is .

Concept:

The two conducting plates kept parallel to each other and placed at a particular distance from one another are considered to be the parallel plate capacitor.

The capacitance of the parallel plates capacitor formed by the two plates is given by the expression:

Here, is the capacitance of the plates, is the dielectric constant of the medium, is the permittivity of free space, is the area of the plates and is the distance between the plates.

The area of the plates is:

Substitute the values in equation of capacitance.

Thus, The capacitance of the capacitor will be or .

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3. Energy density of the energy stored between the plates of capacitor

Answer Details:

Grade: Senior School

Subject: Physics

Chapter: Capacitor

Keywords:

capacitor, capacitance, electric, parallel, plates, particular distance, dielectric constant, permittivity, area of the plates.

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