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As we apply a magnetizing field (H- A/m) then the substance would get magnetic induction (B- unit tesla). As we increase the value of H, B also increases in the same direction in case of ferro magnetic material. But B attains a max value. Then as we start decreasing H back to zero, B does not fall to zero. But some residual B is found in the material. This is called retentivity. Now so as to make B to zero then we have apply H in the negative direction. So as we complete on oscillation of H, B also changes but it goes along a curved path.
Hence the lagging of B with H is known to be hysteresis
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Explain the B-H curve?
hysteresis losses
Why the hysteresis curve is so fat in a sample?
Hard Field
How do you calculate the Hysteresis loss given a B-H curve?
hysteresis loss= K B^1.6 egs/sec where k is STEINMEITZ coefficient and B is the maximum magnetic flux density
Why Soft Iron is suitable for preparing electromagnets?
soft iron B-H curve area is very high and hysteresis loss is proportional to it frequency or no of loop cycles per sec and area of loop so hysteresis loss increases in soft iron as electro magnet
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.
Explain the B-H curve?
hysteresis losses
Why the hysteresis curve is so fat in a sample?
Hard Field
Describe how to distinguish a paramagnet from a ferromagnet by m versus h curves?
A ferromagnet has a steep gradient B /H curve with very noticeable hysteresis. A paramagnet has a shallow curve with almost no hysteresis.
How do you draw hysteresis curve using excel graph?
To draw a hysteresis curve in an Excel document you need to choose chart under the Insert tab, specifying a scatter chart. Then you will specify your data, which should be listed in columns in an Excel document. You can add the trend curve by selecting the Chart tab and going through the options offered.
How do you calculate the Hysteresis loss given a B-H curve?
hysteresis loss= K B^1.6 egs/sec where k is STEINMEITZ coefficient and B is the maximum magnetic flux density
What is the formula of energy loss in hysteresis curve?
P/Vol=A/T P: Power Vol: Volume A: Area T: Period
Why Soft Iron is suitable for preparing electromagnets?
soft iron B-H curve area is very high and hysteresis loss is proportional to it frequency or no of loop cycles per sec and area of loop so hysteresis loss increases in soft iron as electro magnet
Can you measure hysteresis loss for diamagnetic materials?
what is hysteresis losses
What is Hysteresis motor working principle?
It is a special type of synchronous motor.It works on the principle of hysteresis and the torque is produced due to hysteresis
Diagram of hysteresis motor?
can Hysteresis motor use like alternator
What is hysteresis in economics?
It is a situation in business cycle where the long run equilibrium depends on the path followed in short run. For example, shift in labor supply curve in short run due to economic shocks causes wages to rise. Even after the economy stabilises the tendency of wages not to fall is described as hysteresis.(rchekurir@yahoo.co.in)
What does hysteresis mean in magnetism?
A hysteresis curve is a plot, graph or some kind of pictorial representation of the relationship between the magnetic field strength (H) and the magnetic flux density (B) of a material under inspection.
