Magnetic potential
The term magnetic potential can be used for either of two quantities in classical electromagnetism: the" magnetic vector potential", or simply" vector potential", A; and the" magnetic scalar potentialψ".
Both quantities can be used in certain circumstances to calculate the magnetic field B.
The more frequently used magnetic vector potential is defined so that its curl is equal to the magnetic field: formula_ 1.
Together with the electric potential" φ", the magnetic vector potential can be used to specify the electric field E as well.
Therefore, many equations of electromagnetism can be written either in terms of the fields E and B, or equivalently in terms of the potentials" φ" and A.
In more advanced theories such as quantum mechanics, most equations use potentials rather than fields.
The magnetic scalar potential" ψ" is sometimes used to specify the magnetic H- field in cases when there are no free currents, in a manner analogous to using the electric potential to determine the electric field in electrostatics.
One important use of" ψ" is to determine the magnetic field due to permanent magnets when their magnetization is known.
With some care the scalar potential can be extended to include free currents as well.
Historically, Lord Kelvin first introduced vector potential in 1851, along with the formula relating it to the magnetic field.
Magnetic susceptibility
In electromagnetism, the magnetic susceptibility( Latin:," receptive"; denoted) is a measure of how much a material will become magnetized in an applied magnetic field.
Mathematically, it is the ratio of magnetization( magnetic moment per unit volume) to the applied magnetizing field intensity.
This allows a simple classification of most materials' response to an applied magnetic field into two categories: an alignment with the magnetic field, χ>0, called paramagnetism, or an alignment against the field, χ< 0, called diamagnetism.
This alignment has several effects.
First, the magnetic susceptibility indicates whether a material is attracted into or repelled out of a magnetic field.
Paramagnetic materials align with the field, so are attracted to the magnetic field.
Diamagnetic materials are anti-aligned, so are pushed away from magnetic fields.
Second, on top of the applied field, the magnetic moment of the material adds its own magnetic field, causing the field lines to concentrate in paramagnetism, or be excluded in diamagnetism.
Quantitative measures of the magnetic susceptibility also provide insights into the structure of materials, providing insight into bonding and energy levels.
Furthermore, it is widely used in geology for paleomagnetic studies and structural geology.
Fundamentally, the magnetic moment of materials comes from the magnetism of the particles they are made of.
Usually, this is dominated by the magnetic moments of electrons.
Electrons are present in all materials, but without any external magnetic field, the magnetic moments of the electrons are usually either paired up or random so that the overall magnetism is zero( the exception to this usual case is ferromagnetism).
The fundamental reasons why the magnetic moments of the electrons line up or do not are very complex and can not be explained by classical physics( see Bohr–van Leeuwen theorem).
However, a useful simplification is to measure the magnetic susceptibility of a material and apply the macroscopic form of Maxwell's equations.
This allows classical physics to make useful predictions while avoiding the underlying quantum mechanical details.
Betty Corrigall
Betty Corrigall was a Scot whose body was found 150 years after her suicide and burial in an unmarked grave.
Her grave is now a popular tourist site on Orkney, and she was the inspiration behind the 2012 album" Orkney: Symphony of the Magnetic North" by The Magnetic North.
Bruxa (band)
Bruxa are an American electronic band from Portland, Oregon.
The group consists of DJ/ producer Derek Stilwell and vocalists Bianca Radd and Saint Michael Lorenzo.
Their sound has been labelled witch house; however, Stilwell describes their sound as" witchstep," an experimental combination of witch house and dubstep they pioneered.
In 2011, the band released their debut EP," Eye on Everybody", on Sweating Tapes.
This was followed by their first album," Victimeyez", released jointly on the labels Sweating Tapes and Mishka Records in 2012.
The group released a second album," I Do n't Love You Anymore", on Miskha Records in 2014.
The band's name is taken from the Portuguese word for" witch."
Radd, who is half- Brazilian, sings in Portuguese.
Magnetic moment
The magnetic moment is the magnetic strength and orientation of a magnet or other object that produces a magnetic field.
Examples of objects that have magnetic moments include: loops of electric current( such as electromagnets), permanent magnets, moving elementary particles( such as electrons), various molecules, and many astronomical objects( such as many planets, some moons, stars, etc).
More precisely, the term" magnetic moment" normally refers to a system's magnetic dipole moment, the component of the magnetic moment that can be represented by an equivalent magnetic dipole: a magnetic north and south pole separated by a very small distance.
The magnetic dipole component is sufficient for small enough magnets or for large enough distances.
Higher order terms( such as the magnetic quadrupole moment) may be needed in addition to the dipole moment for extended objects.
The magnetic dipole moment of an object is readily defined in terms of the torque that object experiences in a given magnetic field.
The same applied magnetic field creates larger torques on objects with larger magnetic moments.
The strength( and direction) of this torque depends not only on the magnitude of the magnetic moment but also on its orientation relative to the direction of the magnetic field.
The magnetic moment may be considered, therefore, to be a vector.
The direction of the magnetic moment points from the south to north pole of the magnet( inside the magnet).
The magnetic field of a magnetic dipole is proportional to its magnetic dipole moment.
The dipole component of an object's magnetic field is symmetric about the direction of its magnetic dipole moment, and decreases as the inverse cube of the distance from the object.
Jon Balke
Jon Georg Balke( born 7 June 1955) is a Norwegian jazz pianist who leads the Magnetic North Orchestra.
He is the younger brother of saxophonist Erik Balke.
The Magnetic North
The Magnetic North are a British band, formed between multi-instrumentalist Simon Tong( formerly of The Verve, Blur and The Good, the Bad& the Queen), Orcadian artist and producer Gawain Erland Cooper and singer, composer and orchestral arranger Hannah Peel.
Their songs are part autobiography and part psychogeography.
Having come together to make an album that imagined the landscape, legends and people of Gawain Erland Cooper's birthplace, Orkney( 2012 ’s highly acclaimed" Orkney: Symphony of the Magnetic North"), and originally intending to be a one- off, their popularity led them to reconvene to release follow- up" Prospect of Skelmersdale" in 2016- evoking childhood memory, people and place, and an examination of how a failing Northern new town became home to the transcendental meditation movement.
If" Orkney" was the musical equivalent of great nature writing then" Prospect of Skelmersdale" is somewhere between finely- tuned kitchen- sink drama and urban psychogeography.
Inspired as much by the greys and greens of" Kes", as the soothing, cyclical patterns of meditative ragas," Prospect of Skelmersdale" is a collection of musical snapshots of a uniquely British town.
It is a concept album about Tong's Transcendentalist hometown, Skelmersdale.
In an interview with Transverso Media he described it as," a series of little snapshots that I had drawn from my memory of people and places," stating it's," kind of about where I grew up.
I ’m kind of wondering what the people of that town will think about it – whether they ’ll like it or they wo n’t like it.
I do n’t know."
The inspiration for" Orkney: Symphony of the Magnetic North" was the appearance in a dream of Betty Corrigall to Cooper, insisting that he should write an album about his island home.
Azimuth compass
An azimuth compass( or azimuthal compass) is a nautical instrument used to measure the magnetic azimuth, the angle of the arc on the horizon between the direction of the sun or some other celestial object and the magnetic north.
This can be compared to the true azimuth obtained by astronomical observation to determine the magnetic declination, the amount by which the reading of a ship's compass must be adjusted to obtain an accurate reading.
Azimuth compasses were important in the period before development of the reliable chronometers needed to determine a vessel's exact position from astronomical observations.
Nabil Al Busaidi
Nabil Al Busaidi( born on 23 January 1970 in London, United Kingdom), is an Omani adventurer.
He was engaged in a number of feats like walking to the magnetic North Pole, and a climb of Mount Vinson in Antarctica, and a row across the Atlantic Ocean amongst many.
Being the first Arab to accomplish some of these feats, he was voted one of the Top 100 Most Influential Arabs in the world by" Arabian Business" magazine in 2009, the Top 50 Influential Arabs by Middle East magazine in 2009 and 2011, and remains in the Top 500 Power List in 2011 for Arabian Business magazine.
A documentary about his trek to the magnetic North Pole was directed and edited by two- time Emmy Award winning director David Ward.
Magnetic North (disambiguation)
Magnetic North is the direction in which a compass needle points; see Magnetic declination and North Magnetic Pole.
Magnetic North may also refer to:

Question: Did the bands Bruxa (Band) and The Magnetic North, originate from the same country?
Answer: no