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Like the North Magnetic Pole, the North Geomagnetic Pole attracts the north pole of a bar magnet and so is in a physical sense actually a magnetic south pole. It is the center of the 'open' magnetic field lines which connect to the interplanetary magnetic field and provide a direct route for the solar wind to reach the ionosphere.
A pole piece attaches to and in a sense extends a pole of the magnet, hence the name. Pole pieces are used with both permanent magnets and electromagnets. In the case of an electromagnet, the pole piece or pieces simply extend the magnetic core and can even be regarded as part of it, particularly if they are made of the same material. In the ...
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).
For an electromagnet with a cylindrical bore, producing a pure multipole field of order , the stored magnetic energy is: =!. Here, is the permeability of free space, is the effective length of the magnet (the length of the magnet, including the fringing fields), is the number of turns in one of the coils (such that the entire device has turns), and is the current flowing in the coils.
The poles are dark, and pole edges are bright. Magnetic field viewing film is used to show stationary or (less often) slowly changing magnetic fields ; it shows their location and direction. It is a translucent thin flexible sheet, coated with micro-capsules containing nickel flakes suspended in oil. [ 1 ]
Typical magnet fishing equipment, including protective gloves, a bucket for storing catches, antibacterial hand gel, and a neodymium magnet attached to a rope. Magnet fishing is typically done with gloves, [10] a strong neodymium magnet secured to a durable rope between 15 and 30 meters (50–100 ft), and sometimes a grappling hook as a supplement to the magnet. [11]