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Magnetism Challenge
Magnetism Challenge

... Which shows the correct magnetic field around a positive current moving into the board? ...
5H10.11 - Compass Needles and Magnet
5H10.11 - Compass Needles and Magnet

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... stable. Evidence of this comes from analysis of the 29. The magnetic field of the Earth magnetic properties of . Iron atoms in a state tend to align . When the iron , the direction themselves with Earth’s of Earth’s magnetic field is recorded by the orientation of the in the rock. 30. More than reve ...
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... • North poles and south poles always exist in pairs. You can never have two south poles or two north poles on the same magnet. Even if you cut the magnet in half. ...
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... poles; it is produced by the motion of electric charge. • Both the orbital & spinning motion of every electron in an atom produce magnetic fields. ...
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1.3.2 The Magnetic Method Several minerals containing iron and
1.3.2 The Magnetic Method Several minerals containing iron and

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Earth's magnetic field



Earth's magnetic field, also known as the geomagnetic field, is the magnetic field that extends from the Earth's interior to where it meets the solar wind, a stream of charged particles emanating from the Sun. Its magnitude at the Earth's surface ranges from 25 to 65 microteslas (0.25 to 0.65 gauss). Roughly speaking it is the field of a magnetic dipole currently tilted at an angle of about 10 degrees with respect to Earth's rotational axis, as if there were a bar magnet placed at that angle at the center of the Earth. Unlike a bar magnet, however, Earth's magnetic field changes over time because it is generated by a geodynamo (in Earth's case, the motion of molten iron alloys in its outer core).The North and South magnetic poles wander widely, but sufficiently slowly for ordinary compasses to remain useful for navigation. However, at irregular intervals averaging several hundred thousand years, the Earth's field reverses and the North and South Magnetic Poles relatively abruptly switch places. These reversals of the geomagnetic poles leave a record in rocks that are of value to paleomagnetists in calculating geomagnetic fields in the past. Such information in turn is helpful in studying the motions of continents and ocean floors in the process of plate tectonics.The magnetosphere is the region above the ionosphere and extends several tens of thousands of kilometers into space, protecting the Earth from the charged particles of the solar wind and cosmic rays that would otherwise strip away the upper atmosphere, including the ozone layer that protects the Earth from harmful ultraviolet radiation.
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