In terms of Electrical engineering, Electromagnetic Field plays an important role in describing the motion of electric charge. When an electric charge moves in free space electromagnetic field generated. The electromagnetic field refer to the combination of a magnetic field and an electric field. Electromagnetic field, a property of space caused by the motion of an electric charge. A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. Electric and magnetic fields are both components of an electromagnetic field. The electromagnetic field is a combination of electric and magnetic field of force, they are dispersive in nature.
Table of Content
What is Electromagnetic Field?
Electromagnetic field can be defined as, when an electric charge moves in empty space electromagnetic field generated. The electromagnetic field is the combination of a magnetic field and an electric field. Electric and magnetic fields are both components of an electromagnetic field. Electromagnetic field helps in describing the behavior of charged particles and the propagation of electromagnetic waves. The oscillating charges produce magnetic and electric field are observed in wavelike motion.
Key Terminologies of Electromagnetic Field
- Both the Electric field and Magnetic field are essential components of an electromagnetic field, and they both together form the basis of electromagnetism.
- Magnetic Field: It is the space or region around a magnet in which magnetic force is applied to another metallic material.
Formula of Magnetic Field
- Magnetic field (B) = μ0 /2πr
- where ,B stands for the magnetic field magnitude in Tesla T.
- where, μ0 stands for the permeability of free space.
- where, I stands for the magnitude of the electric current in amperes (A)
- where, r stands for the distance in meters (m)
- Electric Field: The force around the electrical charge particle is called an electrical field or electric field intensity. In other words, it is an area around the electric field where the force line exists. It has magnitude and direction. Hence, it is a vector quantity. The symbol E expresses the electric field, and it is measured in newton/coulomb.
- Formula of Electric field = Force/Charge
- E = F/q
Properties of Electromagnetic Field
Some of the properties of Electromagnetic Field are as follows:
- Scalar and Vector Properties
- Transverse in Nature
- Exhibits Dual Nature
- Superposition Principle
- Exhibits Wave Like Properties
- Describes Behavior of Charged Particles
- Speed of Propagation
- Characteristic Wavelength and Frequency
- Electromagnetic Spectrum
Scalar and Vector Properties
- Electromagnetic Field has both scalar and vector properties.
- The scalar properties of the electromagnetic field includes only magnitude.
- The vector properties of the electromagnetic field includes direction and magnitude.
Transverse in Nature
- Electromagnetic waves are always transverse in nature.
- The electric and magnetic fields oscillate perpendicular to the direction of wave propagation.
Exhibits Dual Nature
- Electromagnetic fields shows dual nature, combining the both electric and magnetic components.
- Electromagnetic field describes the behavior of charged particles and the propagation of electromagnetic waves.
Superposition Principle
- Electromagnetic field follows the principle of Superposition, which states , the total electric and magnetic fields at any point in space are the vector sum of the fields from all the sources.
- According to it , every charge in space creates an electric field which is independent to other charges in that medium only.
- The field created by different sources simply gets added together as vectors.
Exhibits Wave Like Properties
- Electromagnetic fields interact with matter through processes like reflection, refraction, absorption, and scattering.
- Electromagnetic fields exhibits both wave like and particle like properties, while the photons being the particles associated with them.
- Electromagnetic field waves travel with a constant velocity in vacuum.
Describes Behavior of Charged Particles
- Electromagnetic field describes the behavior of charged particles and the propagation of electromagnetic waves.
- Electromagnetic field sources consist of two types of charges positive and negative.
- Sometimes the electromagnetic field and gravitational field ripple each other.
Speed of Propagation
- The important property of electromagnetic fields is their speed of propagation, which is constant in a vacuum . This speed, denoted as “c,” is a universal constant.
- The speed of any electric wave or in field is the speed of light, in the free space.
- So the energy is transported according to the speed of light only.
Characteristic Wavelength and Frequency
- Electromagnetic waves exhibit a characteristic wavelength (λ) and frequency (f).
- The relationship between these two properties is given by the equation c = λf, where c is the speed of light.
- We can say that higher the frequency , the higher the energy gets transported and the shorter its wavelength .
Electromagnetic Spectrum
- The electromagnetic spectrum encompasses the entire range of electromagnetic waves.
- It is divided into different regions based on wavelength and frequency, including radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
- It is a continuum of electromagnetic waves which are arranged in according to the wavelength and the frequency .
Electromagnetic Field
Categorization of Electromagnetic Field
The structure of electromagnetic field is categorized in two distinct structure:
- Continuous Structure
- Discrete Structure
Continuous Structure
In Continuous structure both the electric and magnetic fields are thought to be produced by the smooth motion of charged particles. The oscillating charges that produce magnetic and electric fields can be observed in a continuous, smooth and wavelike motion. The energy is viewed as being transferred continuously between two electromagnetic field locations.
Continuous and Discrete Electromagnetic field structure
Discrete Structure
In Discrete Structure ,the transfer of electromagnetic energy is better described as being carried in the form of packets called “quanta” with a fixed frequency. Several experiments have revealed that in a particular circumstance the electromagnetic energy flows in a fixed frequency or a more harsh way in case of a photon. Photon is a single quantum of light of a specific frequency or any other form of electromagnetic radiation.
Planck’s relation links the photon energy ‘E’ of a photon to its frequency ‘f’ through an equation mentioned below:
E = hv
where,
- E stand for Photon Energy
- h stands for Planck’s Constant
- v stands for Frequency of Photon
Applications of Electromagnetic Field
- Mobile phones, radio transmitters are a few examples of the Electromagnetic Fields they produce.
- Electromagnetic Field are produced in kitchen appliances.
- Radar installations, MRI scanners, welding machines, and induction heaters are a few examples of powerful EMF sources in the workplace.
- Electromagnetic Fields are produced in the field such as telecommunications.
- Hospital patients may be exposed to visual radiation and electromagnetic fields. This exposure might be greater than what is considered safe for workers or the general public.
Conclusion
In everyday existence, electromagnetic fields are a part of everyone’s environment, to varying degrees. Electromagnetic fields (EMF) in some businesses might be significantly stronger than those at home or in public areas. We have seen the electromagnetic field structure and the sources of electromagnetic fields A stationary charge will produce only an electric field in the surrounding space. If the charge is moving, a magnetic field is also produced. We have learn the properties of electromagnetic field in this article.
FAQs on Electromagnetic Field
1. What is the source of electromagnetic field?
Electromagnetic fields are generated by natural phenomena like the Earth’s magnetic field but also by human activities, mainly through the use of electricity.
2. Can you give some examples which generates electromagnetic fields ?
Mobile phones, power lines and computer screens are examples of equipment that generates electromagnetic fields.
3. What is electromagnetic field made of?
Electromagnetic field made of charged particles ,such as electrons and protons. These create electromagnetic fields when they move, and these fields transport the type of energy we call electromagnetic radiation, or light.