Wiktor Wise
Electromagnetism is a branch of physics that deals with the study of the electromagnetic force, one of the four fundamental forces of nature. It is the force responsible for the interaction between electrically charged particles, and it plays a crucial role in various chemical and physical phenomena, such as the formation of atoms and molecules. Electromagnetism can be thought of as a combination of electrostatics and magnetism, where charged particles create electromagnetic fields when they move, transporting energy in the form of electromagnetic radiation, such as light. This field of science has been studied since ancient times, with modern advancements building upon the work of prominent scientists like Coulomb, Gauss, and Faraday, who developed namesake laws and equations to describe the behaviour of electromagnetic fields.
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What You'll Learn
The electromagnetic spectrum
Radio waves, at the low-frequency end of the spectrum, have the lowest photon energy and the longest wavelengths—often thousands of kilometres or more. They can be emitted and received by antennas and can pass through the atmosphere, foliage, and most building materials. Radio waves are produced by thermal radiation from matter and are used in radio broadcasting and communication.
Infrared radiation has slightly higher energy and shorter wavelengths than radio waves. It is produced by the heat generated by the motion of charged particles. While humans cannot see infrared radiation, certain animals such as snakes, bullfrogs, and some species of birds can, which helps them find prey or identify mates. Infrared astronomy is used to study distant celestial objects that are too cold to emit visible light.
Visible light is the range of radiation that humans can see, with wavelengths typically between 400 and 750 nanometres. It is produced when an object gets hot enough to cause electrons to move to higher energy levels and emit photons as they return to their original energy levels.
Ultraviolet (UV) light has higher energy and shorter wavelengths than visible light. It is produced by extremely hot objects such as the Sun and is used in sterilisation and fluorescent lighting. While humans cannot see UV light, some animals such as butterflies and birds can, which helps them identify markings on potential mates.
X-rays have even higher energy and shorter wavelengths than UV light. They are produced when high-energy electrons strike a metal plate and are used in medical imaging and security screening.
Gamma rays, at the high-frequency end of the spectrum, have the highest photon energies and the shortest wavelengths—much smaller than an atomic nucleus. They are produced by nuclear reactions and are used in medical treatments and industrial processes.
Each type of electromagnetic radiation in the spectrum has unique characteristics and interactions with matter, providing valuable information and applications across various fields, from astronomy to medicine.
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Electromagnetic radiation
Electromagnetism is an interaction that occurs between electrically charged particles via electromagnetic fields. The electromagnetic force is one of the four fundamental forces of nature and is responsible for many of the chemical and physical phenomena observed in daily life.
Photons are uncharged elementary particles with zero rest mass, and they carry momentum and have no mass. The frequency of a wave is its rate of oscillation and is measured in hertz, with one hertz being equal to one oscillation per second. Light usually has multiple frequencies that sum to form the resultant wave. Different frequencies undergo different angles of refraction, a phenomenon known as dispersion.
EMR is produced by accelerating charged particles, either naturally emitted by celestial bodies or artificially generated for various applications. Its interaction with matter depends on its wavelength, influencing its uses in communication, medicine, industry, and scientific research. For example, radio waves enable broadcasting and wireless communication, infrared is used in thermal imaging, visible light is essential for vision, and higher-energy radiation such as X-rays and gamma rays can be used in medicine to observe the inner parts of the body.
Everyday life is filled with artificially made electromagnetic radiation, from food being heated in microwave ovens to incandescent or fluorescent lights providing artificial illumination in cities.
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Electromagnetic force
Electromagnetism is a branch of science that deals with the relationship between electricity and magnetism. Electromagnetic force is one of the four fundamental forces of nature, and it is the dominant force in the interactions of atoms and molecules. It is the second strongest of the four fundamental forces, with an unlimited range.
The electromagnetic force is responsible for many of the chemical and physical phenomena observed in daily life. It holds atoms together and allows different atoms to combine into molecules. It also plays a role in chemical reactivity and is involved in all forms of chemical phenomena. In addition, electromagnetism has several crucial roles in modern technology, including electrical energy production, light and sound production, sensors, computation, and mechanical motors.
Electromagnetic waves are formed when electrical fields and magnetic fields couple together. These waves can travel through air, solid materials, and even the vacuum of space, as they do not require a medium to propagate. Electromagnetic waves include radio waves, gamma-rays, x-rays, ultraviolet, visible, infrared radiation, and microwaves, all of which differ in their range of frequencies.
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Electromagnetic waves
Electromagnetism is a branch of physics that deals with the relationship between electricity and magnetism. It is the study of electromagnetic forces, which are produced by electrically charged particles and are one of the four fundamental forces of nature. These forces are responsible for many of the chemical and physical phenomena observed in daily life, such as the interactions between atoms and molecules, and the production of light, heat, and sound.
One of the unique properties of electromagnetic waves is their ability to propagate without the need for a medium, meaning they can travel through air, solid materials, and even the vacuum of space. This is in contrast to mechanical waves, such as water waves or sound waves, which require a medium to travel through. The polarization of light is another property of electromagnetic waves, where the alignment of the electromagnetic field can be measured.
The study of electromagnetism has led to many technological advancements, including electrical energy production and distribution, fibre optic and wireless communication, sensors, and mechanical motors. It has also helped us understand natural phenomena, such as lightning and static electricity, and has inspired theories such as Einstein's theory of special relativity.
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Electromagnetic fields
Electromagnetism is a branch of science that deals with the relationship between electricity and magnetism. It is the study of electromagnetic forces produced by electrically charged particles. These electromagnetic forces are responsible for many of the chemical and physical phenomena observed in daily life.
Electromagnetic forces occur between any two charged particles. Electric forces cause an attraction between particles with opposite charges and repulsion between particles with the same charge. On the other hand, magnetism is an interaction that occurs between charged particles in relative motion. These two forces are described in terms of electromagnetic fields.
Charged particles such as electrons and protons create electromagnetic fields when they move. These fields transport electromagnetic radiation, or light. The alignment of the electromagnetic field is measured through polarisation. Light is made of discrete packets of energy called photons, which have no mass and travel at the speed of light.
The study of electromagnetism has led to many technological advancements. These include electrical energy production, transformation and distribution; light, heat, and sound production and detection; fibre optic and wireless communication; sensors; computation; electrolysis; electroplating; and mechanical motors and actuators.
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Frequently asked questions
Electromagnetism is an interaction that occurs between particles with electric charge via electromagnetic fields. It is one of the four fundamental forces of nature and is the dominant force in the interactions of atoms and molecules.
Electric forces cause an attraction between particles with opposite charges and repulsion between particles with the same charge. Magnetic interactions occur between charged particles in relative motion. Together, these forces create electromagnetic fields.
Electromagnetic energy can be described by frequency, wavelength, or energy. Examples of electromagnetic energy include radio waves, microwaves, infrared, visible light, x-rays, and gamma rays.
An electromagnet is a device consisting of a core of magnetic material surrounded by a coil through which an electric current is passed to magnetize the core. Electromagnets are used in various applications, including electrical energy production and light production.
