Essays Tagged: "magnetic fields"

The forever shifting earth

itions of the land masses today is a result of continental drift. During the Earth's existance, the magnetic fields have never been stable. Solidified magma containing magnetic imprints reveal periods ... been stable. Solidified magma containing magnetic imprints reveal periods of time when the Earth's magnetic fields have actually been reversed.Approximately 4.55 billion years ago, the Earth was just ...

(11 pages) 225 0 5.0 Dec/1995

Subjects: Science Essays > Earth Sciences

Leukemia

uclear plants so strict safety precautions are taken. Some research shows that exposure to electric magnetic fields, such as power lines and electric appliances, is a possible risk factor. More studie ...

(3 pages) 66 0 3.7 Feb/1997

Subjects: Humanities Essays > Health & Medicine > Diseases

A glance over the world from the point of view of a Science Fiction Writer who assumes that Time is waved to all directions

ore deep down the oceans?If I multiply and metamorphose into a cloud of spots under the pressure of magnetic fields, will I be able to enlarge my informational surface?The supreme miracle stands for t ...

(5 pages) 26 0 1.0 Jul/2003

Subjects: Social Science Essays > Controversial Issues

Observing Stars.

le because of the emission and reflection of light. 'Light' is the better-known term for the electromagnetic spectrum, which includes waves in the visible, ultra-violet, infra-red, microwave, radio, X ... o large that no region is distinct, several overlap each other. Each of these regions in the electromagnetic spectrum represent transverse waves, travelling as electrical and magnetic fields which int ...

(11 pages) 97 1 2.3 Dec/2003

Subjects: Science Essays > Physics

History of the Study of Magnetism

History of the Study of MagnetismBecause magnetic fields were not discovered until recently, the history of how they were discovered is quite ... the history of how they were discovered is quite interesting, and informative.1.1 The Detection of Magnetic FieldsWe begin by giving an empirical history of the development of electromagnetic theory. ... pirical history of the development of electromagnetic theory. As stated, people had long known that magnetic fields existed, but the only known source of these fields were permanent magnets, and no li ...

(2 pages) 37 1 3.6 May/2004

Subjects: Science Essays > Physics

Nikola Tesla: The Forgotten Father of Technology

the first alternating current (AC) induction motor, based on his research and discovery of rotating magnetic fields. Nikola Tesla had 700 patents in the US and Europe. Tesla's discoveries include the ... ternating current to his advantage. Later, at Budapest, he visualized the principle of the rotating magnetic field and developed plans for an induction motor that would become his first step towards t ...

(7 pages) 55 0 3.5 Oct/2004

Subjects: Science Essays > Technology

WAVES

rgy from one place to another. There are so many types. For example there are mechanical and electromagnetic waves. A mechanical wave is a wave that requires a medium. A medium is the material through ... that requires a medium. A medium is the material through which a mechanical wave travels. An electromagnetic wave is a wave that consists of electric and magnetic fields and does not require a medium ...

(3 pages) 60 1 4.2 Mar/2005

Subjects: Science Essays

One application of magnetic fields in household appliances.

One thing that uses magnetic fields is the electric motor, which is used in many household appliances, such as electric ... small appliances. In this instance the electric motor has an electric current, giving it also this magnetic field.An electric motor converts electricity into mechanical motion.Most electric motors wo ... overarching concept is that a force is generated when a current-carrying element is subjected to a magnetic field. In a cylindrical motor, the rotor rotates because a torque is developed when this fo ...

(14 pages) 48 0 0.0 Sep/2005

Subjects: Science Essays > Physics

Identify data sources, gather and process information and use available evidence to assess the effects of sunspot activity on the Earth's power grid and satellite communications.

Sunspots are dark areas on the solar surface that contain transient and concentrated magnetic fields. They are the most prominent visible features on the photosphere Sun; a moderate-siz ... s large as Earth. Sunspots form and dissipate over periods of days or weeks. They occur when strong magnetic fields emerge through the solar surface and allow the area to cool slightly, from a backgro ... with the Sun. The darkest area at the centre of a sunspot is called the umbra; it is here that the magnetic field strengths are the highest. The less dark, striated area around the umbra is called th ...

(2 pages) 41 0 5.0 Nov/2005

Subjects: Science Essays > Physics

Magnetism

Magnetism is a force that acts at a distance and is caused by a magnetic field. This force strongly attracts ferromagnetic materials such as iron, nickel and cobalt ... is force strongly attracts ferromagnetic materials such as iron, nickel and cobalt. In magnets, the magnetic force strongly attracts an opposite pole of another magnet and repels a like pole. The magn ... ls a like pole. The magnetic filed is both similar and different to an electric field. The lines of magnetic flux flow from one end of the object to the other. Although individual particles such as el ...

(2 pages) 21 0 0.0 Feb/2006

Subjects: Science Essays > Physics

The Sun

called convection. Charged particles, called the solar wind, stream out at a million miles an hour. Magnetic fields within the sun slow down the radiation of heat in some areas, causing sunspots, whic ... ivity picks up as sunspots increase. The Sun's charged, high-speed particles push and shape Earth's magnetic field into a teardrop shape. The magnetic field protects Earth from most of the harmful sol ...

(2 pages) 57 0 5.0 Feb/2006

Subjects: Science Essays > Astronomy

Measurement of the structure and composition of the Earth's atmosphere

y close to the ground. Life on Earth is supported by the atmosphere, solar energy, and our planet's magnetic fields. The atmosphere absorbs the energy from the Sun, recycles water and other chemicals, ... orbs the energy from the Sun, recycles water and other chemicals, and works with the electrical and magnetic forces to provide a moderate climate. The atmosphere also protects us from high-energy radi ...

(4 pages) 34 0 0.0 May/2006

Subjects: Science Essays > Earth Sciences > Meteorology

The Bermuda Triangle - Short and Sweet

ed Atlantis itself- Gas bubble pulling everything down into the ocean- Aliens- A black hole- Strong magnetic fields- Pirates- A time warp- Another one of the US's secret hideouts- Atlantis rising to t ...

(2 pages) 15 0 4.0 Sep/2006

Subjects: Area & Country Studies Essays

Heinrich Rudolf Hertz

e simplest practical antennas. Through experimentation, he proved that transverse free space electromagnetic waves can travel over some distance. With his apparatus configuration, the electric and mag ...

(1 pages) 12 0 3.0 Apr/2007

Subjects: Science Essays > Physics

Physics Lab Report

ixed this problem and a green dot appeared on the screen at the end of the CRT. Because gravity and magnetic fields in the room were acting on the CRT, we had to turn it around to find a plane in whic ...

(2 pages) 17 0 0.0 Feb/2002

Subjects: Science Essays > Chemistry

Continental drift

ch other.Seafloor Spreading Geophysicists, mapping the ocean floor with an instrument that measures magnetic fields, showed that the rocks on one side of the midocean ridge produced an opposing image ...

(3 pages) 25 0 3.0 Feb/2008

Subjects: Science Essays > Environmental Science

Electromagnetic Radiation

What is Electromagnetic Radiation?? The transfer of energy through outer free space or through a material medium in ... The transfer of energy through outer free space or through a material medium in the form of electromagnetic waves. Also a vacuum is the only perfectly transparent medium.The main types of electromagn ... t, visible light, infrared light, microwaves, and radio waves. These and other many types of electromagnetic radiation travel at the same speed, which is the speed of light (186,282mps), but they vary ...

(1 pages) 1214 0 5.0 Feb/2008

Subjects: Science Essays > Physics

Electromagnetic Radiation

What is Electromagnetic Radiation?? The transfer of energy through outer free space or through a material medium in ... The transfer of energy through outer free space or through a material medium in the form of electromagnetic waves. Also a vacuum is the only perfectly transparent medium.The main types of electromagn ... t, visible light, infrared light, microwaves, and radio waves. These and other many types of electromagnetic radiation travel at the same speed, which is the speed of light (186,282mps), but they vary ...

(1 pages) 365 0 0.0 Feb/2008

Subjects: Science Essays > Physics

Electromagnetic Radiation

What is Electromagnetic Radiation?? The transfer of energy through outer free space or through a material medium in ... The transfer of energy through outer free space or through a material medium in the form of electromagnetic waves. Also a vacuum is the only perfectly transparent medium.The main types of electromagn ... t, visible light, infrared light, microwaves, and radio waves. These and other many types of electromagnetic radiation travel at the same speed, which is the speed of light (186,282mps), but they vary ...

(1 pages) 626 0 5.0 Feb/2008

Subjects: Science Essays > Physics

Magnetic Levitation

Magnetic levitation is made possible by magnetic fields that are actively excluded from superconduct ... ent magnet is placed above a superconductor, it can be levitated by this repulsive force.One use of magnetic levitation in today's world is transportation. For example, it's possible to run a train on ... roblem by adding more weight on one side to even it out. Doing this project, I learned about magnetic levitation, which I knew nothing about beforehand. I now know how magnets can be used in te ...

(1 pages) 7 0 0.0 Feb/2008

Subjects: Science Essays > Chemistry