Verified Answer

QuestionQuestion 8

Explain the phenomenon of electric polarization. Discuss how the phenomenon of polarization account for the increase in capacitance of a capacitor when instead of air, dielectric is inserted between its plates?

Solution

Sure. Electric polarization is the alignment of electric charges in a material in response to an external electric field. The charges in a material are usually randomly distributed, but when an external electric field is applied, the charges tend to align themselves in the direction of the field. This creates a net electric dipole moment in the material.

The dielectric constant of a material is a measure of how easily it can be polarized. Materials with a high dielectric constant are more easily polarized than materials with a low dielectric constant.

When a dielectric is inserted between the plates of a capacitor, the electric field between the plates polarizes the dielectric. This creates a net electric field in the dielectric that opposes the applied electric field. This reduces the effective electric field between the plates, which increases the capacitance of the capacitor.

The capacitance of a capacitor is given by the following equation:

C = εA/d

where:

* C is the capacitance (in farads)
* ε is the dielectric constant of the material between the plates (in farads per meter)
* A is the area of the plates (in square meters)
* d is the distance between the plates (in meters)

Tip

Explaination

As you can see, the capacitance is proportional to the dielectric constant. This means that increasing the dielectric constant will increase the capacitance of the capacitor. The dielectric constant of a material depends on the properties of the material, such as its molecular structure and its polarizability. Materials with a high dielectric constant are typically made up of molecules that have a permanent electric dipole moment. These molecules can easily align themselves in the direction of an external electric field, which makes the material more easily polarized. &exampleExamples of Materials&example Here are some examples of materials with a high dielectric constant: * Water * Glass * Mica * Teflon These materials are often used as dielectrics in capacitors.
Physics XII (FBISE)

Context

Chapter 3: Electromagnetism

Chapter 4: Electromagnetic induction

Chapter 5: Alternating Current

Chapter 6: Physics of Solids

Chapter 7: Electronics

Chapter 8: Dawn Of the Modern Physics

Chapter 9: Atomic Spectra

Chapter 10: Nuclear Physics

Utopains

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