What is magnetic field?
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A magnetic field is a physical phenomenon generated by moving electrical charges, such as electric currents . It exerts forces on other moving charges and magnetic materials, attracting objects with metal characteristics and penetrating various materials like wood and build . Magnetic fields are crucial in various applications, including scientific research, materials processing, and nuclear fusion, with different types of magnets producing diverse magnetic fields . In electrical engineering, magnetic fields play a vital role in devices like motors, transformers, and magnetic levitation systems, originating from currents and interacting with currents to create forces . Magnetic field generators can consist of multiple groups of magnets with rotatable magnetic moments, each group having a distinct orientation to generate unique field characteristics .
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| Papers (5) | Insight |
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| A magnetic field is generated by a system of rotatable magnets with linearly independent orientations, as described in the "Magnetic field generator" paper, influencing the space around it. | |
8 Citations | A magnetic field is a physical environment affecting various processes. The paper introduces a periodic magnetic field created by rotating permanent magnet pairs for scientific research applications. |
| "Magnetic fields are part of electromagnetic fields, encompassing electric power, radio waves, microwaves, and mobile phone frequencies, discussed for their toxicity and carcinogenicity in humans." | |
| The paper provides information about magnetic fields, which originate from currents and exert forces on currents. It explains that magnetic fields are important in electrical engineering and have various applications. | |
| The paper provides a definition of magnetic field as a field formed by moving electrical charges (electric current) that causes a force in an electric charge that moves. |
Related Questions
What is magnetic resonance imaging (MRI)?7 answersMagnetic Resonance Imaging (MRI) is a sophisticated diagnostic tool that leverages the electromagnetic properties of living tissues to produce highly detailed cross-sectional images of the body, without the use of ionizing radiation. It operates on the principle of nuclear magnetic resonance, where MRI images are formed based on signals received from the nuclei of hydrogen atoms in water and fat molecules within the body. The process involves the application of a strong magnetic field and radiofrequency waves, causing the nuclei to emit signals that are then converted into images by a computer system. MRI's ability to render the highest soft-tissue contrast images of all imaging modalities has significantly impacted clinical radiology.
MRI is particularly valued for its versatility in evaluating various body parts, including the brain, musculoskeletal system, abdomen, and internal derangement of the knee, by utilizing a combination of pulse sequences to detect pathology in different tissues. Its clinical applications are broad, ranging from the diagnosis of complex diseases such as cancer, cardiovascular, and neurologic disorders to monitoring therapy. The technology behind MRI includes four fundamental components: the primary magnet, gradient system, radiofrequency system, and computer system, which work together to generate images for clinical interpretation.
Safety concerns associated with MRI involve the large magnetic force, which can turn ferromagnetic objects into projectiles and cause burns, and the potential malfunction of electronic medical devices. Gadolinium-based contrast agents are sometimes used to enhance the visibility of certain tissues, although their use is restricted in patients with impaired renal function due to the risk of nephrogenic systemic fibrosis. Despite these challenges, ongoing advancements in MRI technology, including the development of new hardware and image reconstruction techniques, are making it more accessible for both clinical and industrial applications.
What is magnetosphere?5 answersThe magnetosphere is the region of space around a celestial body, such as the Earth, where plasma behavior is dominated by the geomagnetic field. It extends from the interior of the celestial body to outer space and protects it from charged particles emitted by the Sun and cosmic rays. The Earth's magnetosphere extends tens of thousands of kilometers into space beyond the ionosphere and is shaped by the magnetic field. It is compressed on the day side of the Earth by the solar wind and dragged out on the night side into a long magnetotail. Charged particles that penetrate the magnetosphere are trapped by geomagnetic field lines and shuttle between the polar regions. The magnetosphere is also associated with the formation of the Van Allen belts, zones of intense radiation that girdle the Earth at altitudes between 1,000 km and 60,000 km..
What are the characteristics of the Earth's magnetic field?5 answersThe Earth's magnetic field is essential for life on Earth, as it forms a magnetic shield around the planet, protecting it from high energy particles and radiation from the Sun. The field is not constant but changes with time, a phenomenon known as secular variation. Time variations in the field can range from milliseconds to millions of years. The field is characterized by geomagnetic jerks, which are rapid changes in the slope of the secular variation. The field is generated mainly by a self-sustaining dynamo in the fluid outer core. The field has been extensively studied and documented, thanks to various approaches including measurements from observatories and space, as well as the analysis of surface rocks.
What is field?4 answersA field is a mathematical concept that refers to a set equipped with operations such as addition, subtraction, multiplication, and division. It is a subset of a larger set, such as the set of complex numbers or the set of real numbers. In the context of big data analysis, a field is a named subspace within a space where data points are treated as points. The subspace of a field can change based on the points included in it, and it can also be nested. By assigning a field to a meaningful portion of data, it allows for the efficient processing of big data by focusing only on the portions of interest. In the context of elementary education, the Field is a simulated virtual environment designed to teach scientific inquiry skills to students. It helps them learn skills such as observation, data collection, and hypothesis generation. In the context of physics, a field is considered an independent physical entity that plays a role in relativistic physics, similar to matter particles.
What is the difference between an electric field and a magnetic field?2 answersAn electric field is produced by charges and exerts forces on charges, whether they are moving or stationary. It exists due to the presence of a static charge and is related to the electric flux density through the permittivity of the medium. On the other hand, a magnetic field is generated by charged particles that are at rest or in motion. It exerts a force on an electric charge only if the charge is moving, and the strength of the force depends on the direction of the charge's motion. The combination of electric and magnetic fields forms an electromagnetic field, which is a special distribution of parameters that may or may not be time-dependent. Time-varying electromagnetic fields produce waves that radiate from the source.
What are the differences between electric and magnetic fields?5 answersElectric fields and magnetic fields are different in their origins and effects. Electric fields are produced by static charges, while magnetic fields are produced by moving charges or currents. Electric fields exert forces on charges, while magnetic fields exert forces on currents. Electric fields are described by the relationship between electric field and electric flux density, while magnetic fields are described by the relationship between magnetic field and magnetic flux density. Electric fields can be shielded by conducting objects and have little penetrative ability, while magnetic fields can penetrate tissue and are not easily shielded. Electric fields are perturbed and intensified by conducting objects, while magnetic fields decline rapidly with distance from their source. Electric fields are associated with shocks and burns from direct contact with electrical conductors, while magnetic fields have been investigated for their possible health consequences.