[Q]Is field made by Polarization different from external field?

In summary, in this conversation, the topic of polarization in dielectric matter is discussed. It is mentioned that an external field causes polarization, resulting in bounded volume and surface charge. The question is raised whether the field induced by bounded charge is different from the original external field. One person believes it is different, while another says only the magnitude of the field changes without a change in direction. The final statement clarifies that both the magnitude and direction of the field can change in a polarized material. Reference is also given to check Feynman's lectures for more information on this topic.
  • #1
good_phy
45
0
Hi.

It is supposed that External field imposes to dielectric matter and Polarization occurs.

Thus, Bounded volumb and surface charge are made.

My question is, is field induced by Bounded charge in addition to original(external) field

different from original field existing alone(Situation in which There is no matter causing

Polarization)?

I think and Textbook said it is different. But Someone said Just magnitude of field changes

without direction.


I'd like to make it sure.
 
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  • #2
Both the magnitude and the direction of the field can change in a polarized material. Check Feynman's lectures, vol II, chaps 10 for the first and 30 for the second.
 
  • #3


I can confirm that the field created by polarization is indeed different from the external field. When a dielectric material is placed in an external electric field, the molecules in the material align themselves in the direction of the field, creating a dipole moment. This alignment of dipoles results in the creation of a new electric field, known as the polarizing field. This field is in addition to the original external field and can be thought of as the "response" of the material to the external field.

The polarizing field is not just a change in magnitude, but also a change in direction. This is because the dipoles are aligned in a specific direction, which creates a new electric field with a different direction than the original external field. This can be seen in the presence of surface and volume charges, which are a result of the polarizing field.

In the absence of a dielectric material, there is no polarization and thus no polarizing field. In this case, the external field remains unchanged as there is no material to respond to it. Therefore, the field induced by bounded charges in the presence of polarization is indeed different from the original field existing alone.

I hope this clarifies any confusion and confirms the information provided in your textbook. As scientists, it is important to thoroughly understand and accurately represent the concepts and phenomena being studied.
 

1. What is the difference between a field made by polarization and an external field?

The main difference between a field made by polarization and an external field is that a field made by polarization is created by the alignment of polar molecules within a material, while an external field is created by an external source such as a charged particle or a magnetic field. This means that the strength and direction of the field will vary depending on the material and its alignment of polar molecules in the case of polarization, while an external field will have a constant strength and direction.

2. How does polarization affect the strength of a field?

Polarization can affect the strength of a field by increasing or decreasing it, depending on the alignment of polar molecules within a material. When these molecules are aligned in the same direction, the field will be stronger, while when they are aligned in opposite directions, the field will be weaker. This is because the aligned molecules create a cumulative effect, amplifying the overall strength of the field.

3. Can a material have both a field made by polarization and an external field?

Yes, a material can have both a field made by polarization and an external field. In fact, this is often the case in many situations. For example, in an electric circuit, the flow of electrons creates an external electric field, while the alignment of polar molecules in the wires also creates a field made by polarization. These two fields can interact with each other and affect the behavior of the circuit.

4. How can we measure the strength of a field made by polarization?

The strength of a field made by polarization can be measured using a variety of techniques such as polarimetry, which measures the rotation of polarized light passing through a material, or dielectric spectroscopy, which measures the dielectric properties of a material. Other methods include using a Faraday cage to shield the material from external fields and measuring the resulting change in the field made by polarization.

5. What are some real-world applications of fields made by polarization?

Fields made by polarization have many real-world applications, including in electronic devices such as LCD screens, where the alignment of polar molecules controls the passage of light. They are also used in sensors and detectors, such as infrared sensors, which use the polarization of light to detect objects. Additionally, fields made by polarization play a crucial role in the functioning of living organisms, such as in the polarization of cells and tissues in the human body.

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