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The magnetization left behind in a ferromagnetic material (e.g. iron) after an external magnetic field is removed.
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What is the significance of B-H curve?
H is the symbol for magnetic field strength, which is defined as the magnetomotive force per unit length of a magnetic circuit, where the magnetomotive force is provided by a current-carrying coil, wound around that magnetic circuit. Magnetomotive force is the product of the current flowing through the coil and the number of turns, expressed in amperes (although often spoken as "ampere turns").The magnetomotive force gives rise to the magnetic flux within the magnetic circuit, the intensity of which is termed flux density (symbol B), expressed in teslas.A B-H curve plots changes in a magnetic circuit's flux density as the magnetic field strength is gradually increased. The resulting shape indicates how the flux density increases due to the gradual alignment of the magnetic domains (atoms, that behave like tiny magnets) within the magnetic circuit material. When all the domains have aligned, the B-H curve reaches a plateau and the magnetic circuit is said to be saturated. At this point, any further increase in magnetic field strength has no further effect on the flux density. Different magnetic materials, such as iron, steel, etc., have B-H curves with different slopes and points at which saturation occurs.After reaching saturation, a reduction in the magnetic field strength results in a reduction in the flux density. However, the resulting curve does not quite match the original curve, but 'lags behind' it. This effect is called hysteresis, which is from the Greek, meaning to 'lag behind'.When the magnetic field strength reaches zero, the resulting curve indicates that the flux density has not, itself, reached zero. The value of flux density remaining is termed the remanence (or residual magnetism) of the magnetic material. 'Soft' magnetic materials, used in the manufacture of transformer cores, etc., will have a very small remanence; whereas 'hard' magnetic materials, used in the manufacture of permanent magnets, will have a very high remanence.In order to remove any remanence, the magnetic field strength requires to be reversed (by reversing the direction of the current in the coil) and increased in the opposite direction. The amount of 'negative' magnetic field strength necessary to completely remove the remanence is called coercivity.If we continue to increase the negative magnetic field strength, the magnetic material will again reach saturation in the opposite direction, and the new curve will be a mirror image of the original curve. The complete B-H curve is then usually described as a hysteresis loop. The area contained within a hysteresis loop indicates the energy required to perform the 'magnetise - demagnetise' process.'Soft' magnetic materials require relatively little energy to become magnetised and demagnetised and, so, have 'narrow' hysteresis loops, whereas 'hard' magnetic materials require a great deal of energy and have 'wide' hysteresis loops.So, B-H Curves and Hysteresis Loops are a valuable tools for comparing the characteristics and behaviour of different magnetic materials, in order to select them for an appropriate application.
What is the difference between para-magnetism and ferro-magnetism?
Paramagnetism refers to materials like aluminum or platinum which become magnetized in a magnetic field but their magnetism disappears when the field is removed. Ferromagnetism refers to materials (such as iron and nickel) that can retain their magnetic properties when the magnetic field is removed and kifjkjf
Which element is used to make permanent magnets?
The metal you must use must be made of of iron or steel, it won't work if the item is made of something like aluminum, brass, lead or plastic because those materials are non-magnetic!A steel screwdriver is a good thing to try to magnetise because you can use it to pick up small screws if you drop them inside something that's so small you can't get your fingers into it!Lots of people try to make a magnet using both poles of a horseshoe-shaped magnet but then it won't work as well because the second pole of the magnet will reverse the magnetising effect of the first pole.All you have to do is keep stroking the metal, always going in just one direction only and then pick up the magnet at the end of each stroke.Pressing hard, stroke the metal over and over like that with just one pole of your magnet until the metal gets magnetized.
What is Data remanence is?
File structures that remain after a file has been deleted
What has the author James K Goldston written?
James K. Goldston has written: 'A guide to understanding data remanence in automated information systems' -- subject(s): Information storage and retrieval systems, Security measures, Computer security
What has the author D W Emerson written?
D. W. Emerson has written: 'Magnetic exploration models, incorporating remanence, demagnetization and anisotropy HP 41C handheld computer algorithms' -- subject(s): Magnetic prospecting, Data processing
What is used to make magnets?
A good permanent magnet should produce a high magnetic field with a low mass, and should be stable against the influences which would demagnetize it. The desirable properties of such magnets are typically stated in terms of the remanence and coercivity of the magnet materials.
How do you get enclave remanence armor in Fallout New Vegas?
first you need to make arcade gannon your companion then you need to bring him to three places to trigger his memory i know 2 are repfconn headquarters and the crashed vertibird you can look up the other ones then he will give you a quest and follow that to reform the enclave and you will receive the armor
Why sram is called static ram?
Static random-access memory (SRAM) is a type of semiconductormemory that uses bistable latching circuitry to store each bit. The term staticdifferentiates it from dynamic RAM (DRAM) which must be periodically refreshed. SRAM exhibits data remanence,[1]but it is still volatilein the conventional sense that data is eventually lost when the memory is not powered.
What is difference between residual magnetism and retentivity?
Residual magnetism and remanence are the same thing. The term residual magnetism is often used in engineering applications. Both terms describe the magnetization, and measure of that magnetism, left behind in a ferromagnetic material after the external magnetic field is removed.
How would you write about SRAM?
---SRAM--- Static random access memory (SRAM) is a type of semiconductor memory where the word static indicates that it, unlike dynamic RAM (DRAM), does not need to be periodically refreshed, as SRAM uses bistable latching circuitry to store each bit. SRAM exhibits data remanence, but is still volatile in the conventional sense that data is eventually lost when the memory is not powered. The term SDRAM, which stands for synchronous DRAM, should not be confused with SRAM.
How wartsila abb amg 1600 produce electrical energyand the generator operate?
the prime mover rotates the rotor of the alternator. the exciter contains stator coils with remanence induces voltage in the rotating windings of the exciter rotor which is then rectified and goes through the main field winding. the rotating rotor flux cuts through the stator windings inducing voltage on them. the AVR controls the field current to the exciter stator coils. DC current for pole formation.
What are some nine letter words with 1st letter R and 5th letter N and 6th letter E?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 11 words with the pattern R---NE---. That is, nine letter words with 1st letter R and 5th letter N and 6th letter E. In alphabetical order, they are: reannexed reannexes refinedly remanence remanency remanents repaneled retinenes ringnecks rollnecks rubineous
What are some nine letter words with 2nd letter E and 5th letter N and 6th letter E and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 6 words with the pattern -E--NEN--. That is, nine letter words with 2nd letter E and 5th letter N and 6th letter E and 7th letter N. In alphabetical order, they are: deponents desinence remanence remanency remanents retinenes
What are some nine letter words with 5th letter N and 6th letter E and 7th letter N?
According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 15 words with the pattern ----NEN--. That is, nine letter words with 5th letter N and 6th letter E and 7th letter N. In alphabetical order, they are: deponents desinence exponents immanence immanency imminence imminency imponents limonenes opponency opponents remanence remanency remanents retinenes
