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Magnetism - NASA
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WebHealth Implicaons of Long-term Exposure to Electrosmog . KI_Brochure-6_K_Hecht_web . KI_Brochure-6_K_Hecht_web The north magnetic pole, also known as the magnetic north pole, is a point on the surface of Earth's Northern Hemisphere at which the planet's magnetic field points vertically downward (in other words, if a magnetic compass needle is allowed to rotate in three dimensions, it will point straight down). … See more All magnets have two poles, where the lines of magnetic flux enter and emerge. By analogy with Earth's magnetic field, these are called the magnet's "north" and "south" poles. The north-seeking pole of a magnet was defined to … See more Early European navigators, cartographers and scientists believed that compass needles were attracted to a hypothetical "magnetic island" somewhere in the far north (see Rupes Nigra), or to Polaris, the pole star. The idea that Earth itself acts as essentially a giant … See more Historically, the magnetic compass was an important tool for navigation. While it has been widely replaced by Global Positioning Systems, many airplanes and ships still carry them, as do casual boaters and hikers. The direction in … See more Over the life of Earth, the orientation of Earth's magnetic field has reversed many times, with magnetic north becoming magnetic south and vice versa – an event known as a geomagnetic reversal. Evidence of geomagnetic reversals can be seen at See more First observations The first group to reach the north magnetic pole was led by James Clark Ross, who found it at Cape Adelaide on the Boothia Peninsula on June 1, 1831, while serving on the second arctic expedition of his uncle, See more As a first-order approximation, Earth's magnetic field can be modeled as a simple dipole (like a bar magnet), tilted about 10° with respect to Earth's rotation axis (which defines the … See more • Polar alignment See more WebEin magnetischer Dipol erzeugt ein Magnetfeld, an einem Ort in größerer Entfernung gegeben durch die magnetische Flussdichte. ist dabei der Betrag von , ist die magnetische Feldkonstante und ist die Kugeloberfläche im Abstand . Diese Formel gilt unabhängig von der Form und der Größe der Stromschleife, der Magnetspule, des Stabmagneten ... razor\\u0027s 4m