Physical Interpretation of Poynting Vector
In order to understand what the Poynting vector physically signifies, we need to understand the definition of the Poynting vector and understand the physics behind it.
In physics, the Poynting vector gives us the directional energy flux or power flow of an electromagnetic field. we can understand energy flux as the energy transfer per unit area, per unit time. The cross product in the Poynting vector signifies the direction in which energy is transported. The magnitude of the Poynting vector denotes the power per unit area i.e. the power density of the electromagnetic wave.
Hence we can say that the vector provides us with direction and intensity of energy flow within an electromagnetic field.
Poynting Theorem
The physical interpretation of Poynting vector can be understood by Poynting theorem which states that
Poynting’s theorem states that the rate of energy transfer per unit volume from a region of space equals the rate of work done on the charge distribution in the region, plus the energy flux leaving that region.
Poynting Vector
Poynting Vector as the name suggests is a quantity that has both magnitude and direction. In the electrical industry, whilst dealing with electromagnetic waves, we often have to come across some tools that can help us analyze these waves. If we think about how electromagnetic waves travel, we realize that we need a term to define the energy flux density of these waves and this is represented by Poynting Vector. Basically, the Poynting vector represents power per unit area. It generally is defined as the cross-product of an electric field and magnetic field, giving us the direction of energy flux which is in the direction of wave propagation. In this article, we will learn about Poynting Vector, its meaning, and its physical Interpretation. We will also discuss the components used in the formula of the Poynting vector. Later we will discuss some advantages and disadvantages of the Poynting vector and how are they put into use. We will conclude the article with some Frequently Asked Questions.
Table of Content
- What is Poynting Vector?
- Physical Interpretation of Poynting Vector
- Formula of Poynting
- Advantages of Poynting Vector
- Disadvantages of Poynting Vector
- Vector Applications of Poynting Vector
- Solved Examples
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