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Physics behind magnetism
Physical science magnetic field
Physics behind magnetism
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My goal in writing this paper is two fold. Goal one is to try and understand how a stationary magnet exerts force by means of a magnetic field (even across a complete vacuum). Frequently, electromagnetic fields are compared to the gravitational field. Goal two is to explore the similarities between the two types of fields to see if comparison throws any light on the mechanism of magnetic field generation.
The term action-at-a-distance is often used to describe forces that travel through space and exert their effect without directly touching the objects acted upon. Newton's idea of instantaneous action-at-a-distance has been replaced by the modern action-at-a-distance which is transmitted at the speed of light so as to avoid conflict with Relativity Theory (Hoyle and Narlikar 1974). The term "field theory" either replaces action-at-a-distance or is used as the means by which action-at-a-distance transmits force. In this paper "field" will represent the means of transmitting forces such as electromagnetism and gravity, avoiding the need for the term action-at-a-distance.
Magnetic fields are frequently compared to gravitational fields. Gravitational fields cause a curvature of space-time. That curvature of space-time provides a mechanism for the gravitational attraction between masses. A magnet also causes a curvature of space-time. In fact a magnet can cause space-time curvature in several distinct ways.
2. Kirkpatrick, Larry D. and Gerald F. Wheeler. Physics: A World View. ed. 4. Harcourt College Publishers. Fort Worth. 2001.
(5) Sur ce point, voir notre article "Les forces, les formes et l’esprit dans la perception de la peinture", in : P. Magnard (dir.), Métaphysique de l’esprit, De le forme à la force, Paris, Vrin, 1996, pp. 207-217.
The theory of relativity is the basic theory about space-time continuum and gravitation which was mainly established by the greatest theoretical physicist Albert Einstein. According to the areas it aims to describe, Einstein’s theory of relativity can be classified into special relativity (space-time) and general relativity (gravitation) 1. The theory of relativity, as do quantum mechanics, brought a revolutionary impact on the foundation of modern physics, and thus had an impact on modern technology. And it impacted the “common sense” understanding that people had of the universe by its new concepts such as four dimensional spaces and curved space.
How can a man entangled in the dangerous crimes of smuggling, so engrossed with his past love that he lost her, and shed his own blood due to a misunderstanding ever be forgiven? In other words, should he be condoned for his acts, or should he forever be in Hell and forgotten? One might acknowledge the fact that this man's past, behavior, and intentions are unknown, therefore standing in either a positive or neutral view. Another might add that sins can never be forgiven, no matter what reasons had caused them, leaning toward a negative standpoint. Jay Gatsby, a character in F. Scott Fitzgerald’s novel The Great Gatsby, is much like the preceding man described, having faced the shame and committing the same dishonorable acts, and is often criticized by those in a negative standpoint. However, within the text, Nick Carraway, the narrator of the novel, plainly states, “Gatsby turned out all right at the end” (6). Nick knew all about the immoral deeds Gatsby had carried out, so how could Nick make this claim in honor of a dead man? The answer is quite simple: Nick realized Gatsby’s incorruptible dream was the most admirable feat out of all the characters in the book, something that not only made Gatsby respectable to Nick, but great.
Nicholas Carr is an author that focuses on the real word changing. His main focuses are the changes in technology, business and the culture. One of his essay’s, “Is Google Making Us Stupid,” focuses on whether or not the Internet is creating problems within today’s society, and with our learning abilities in general. Carr provides detailed examples from Google, research teams and our own history to show the impact it has on today’s life and the minds’ of Internet users.
Quantum Mechanics This chapter compares the theory of general relativity and quantum mechanics. It shows that relativity mainly concerns that microscopic world, while quantum mechanics deals with the microscopic world.
A hundred years ago, a young married couple sat at a kitchen table talking over the items of the day while their young boy sat listening earnestly. He had heard the debate every night, and while there were no raised voices, their discussion was intense. It was a subject about which his parents were most passionate - the electrodynamics of moving bodies in the universe. The couple were of equal intelligence and fortitude, working together on a theory that few people can comprehend even to this day. Mileva Maric Einstein was considered to be the intellectual equal of her husband Albert, but somehow went unrecognized for her contributions to the 1905 Papers, which included the Special Theory of Relativity. The stronger force of these two bodies would be propelled into the archives of scientific history, while the other would be left to die alone, virtually unknown. Mrs. Einstein was robbed. She deserved to be recognized for at least a collaborative effort, but it was not to be. The role which society had accorded her and plain, bad luck would prove to be responsible for the life of this great mathematician and scientist, gone unnoticed.
Kirkpatrick, Larry, and Gerald F. Wheeler. Physics: A World View. 4th ed. Orlando: Harcourt College Publishers, 2001.
Magnetic Field: The Earth has a superior magnetic field due to a core consisting of iron and nickel. Currently the rotation of the Earth and its Coriolis effect help to create this pull of the tides from the oceans. The northern lights or lurora Borealis can be seen at various times in a mystifying view of beauty.
The relationship between electricity and magnetism is that each phenomenon generates a field. Electric fields can be pictured by thinking in terms of gravitational forces. Where, any two objects have a gravitational force on one another. Any two electric charges have a force between them (either repelling, or attracting depending on polarity). These electric fields are vector forces, with size and direction at each point in space....
In 1905, Albert Einstein wrote his paper on the special theory of relativity (Prosper). This theory has the reputation as being so exotic that few people can understand it. On the contrary, special relativity is simply a system of kinematics and dynamics, based on a set of postulates that is different from those of classical mec...
The phenomenon called electromagnetic induction was first noticed and investigated by Michael Faraday, in 1831. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing magnetic field about the conductor and is a very important concept. Faraday discovered that, whenever the magnetic field about an electromagnet was made to grow and collapse by closing and opening the electric circuit of which it was a part, an electric current could be detected in a separate conductor nearby. Faraday also investigated the possibility that a current could be produced by a magnetic field being placed near a coiled wire. Just placing the magnet near the wire could not produce a current. Faraday discovered that a current could be produced in this situation only if the magnet had some velocity. The magnet could be moved in either a positive or negative direction but had to be in motion to produce any current in the wire. The current in the coil is called an induced current, because the current is brought about (or “induced”) by a changing magnetic field (Cutnell and Johnson 705). The induced current is sustained by an emf. Since a source of emf is always needed to produce a current, the coil itself behaves as if it were a source of emf. The emf is known as an induced emf. Thus, a changing magnetic field induces an emf in the coil, and the emf leads to an induced current (705). He also found that moving a conductor near a stationary permanent magnet caused a current to flow in the wire as long as it was moving as in the magnet and coiled wire set-up.
The Earth’s magnetic field is a major component to exploring the earth. The north and the south poles have always been a guide for travelers. Using compasses, the direction of the north pole and the south pole has always been provided by the magnetic force of the magnetic field. What many people do not know though is the earth’s magnetic field provides way more than that. The magnetic field, also known as the magnetosphere, protects us from all kinds of harmful substances. Some of these substances include solar wind and harmful radiation from the sun. The magnetosphere also protects the atmosphere, which protects us.
Magnets are stones that produce magnetic fields. The magnetic field is invisible, but is responsible for the most noticeable aspect of a magnet: the attraction of a metal object or the repulsion of another magnet. Magnets are used in common everyday household items: credit cards, TVs, speakers, motors, and compasses. A magnets strength is measured by its magnetic moment. (“Magnetism”)
Electric currents produce magnetic fields, they can be as small as macroscopic currents in wires, or microscopic currents in atomic orbits caused by electrons. The magnetic field B is described in terms of force on a moving charge in the Lorentz force law. The relationship of magnetic field and charges leads to many practical applications. Magnetic field sources are dipolar in nature, with a north and south magnetic pole. The magnetic field SI unit is the Tesla, it can be seen in the magnetic part of the Lorentz force law F magnetic = qvB composed of (Newton x second)/(Coulomb x meter). The smaller magnetic field unit is the