What is magnetic hysteresis Class 12?

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized.

What do you mean by magnetic hysteresis?

When an external magnetic field is introduced to a ferromagnet substance like iron, the atomic dipoles align themselves with it, this is known as magnetic hysteresis. Part of the alignment will be kept even if the field is removed; the substance has become magnetic.

What is magnetic hysteresis loop Class 12?

The magnetic hysteresis, better known as the hysteresis loop, describes the magnetizing force (H) versus the magnetic flux density ( B) of the ferromagnetic material. The curvature of the hysteresis is characteristic of the form of material being observed and may differ in size and shape (i.e. narrow or wide).

What is hysteresis in simple terms?

As a general term, hysteresis means a lag between input and output in a system upon a change in direction. Hysteresis is something that happens with magnetic materials so that, if a varying magnetizing signal is applied, the resulting magnetism that is created follows the applied signal, but with a delay.

What is magnetic hysteresis explain it with hysteresis curve?

A magnetic hysteresis, otherwise known as a hysteresis loop, is a representation of the magnetizing force (H) versus the magnetic flux density (B) of a ferromagnetic material. The curvature of the hysteresis is characteristic of the type of material being observed and can vary in size and shape (i.e. narrow or wide).

Hysteresis

What do you mean by magnetic hysteresis and coercive force?

Retentivity: The property of the magnetic material to retain magnetism even in the absence of the magnetizing field is known as retentivity or remanence. Coercivity: The magnetizing field (H) needed to demagnetize the magnetic material completely is known as its coercivity.

What is magnetic hysteresis explain BH curve for a ferromagnetic material?

The B-H curve or magnetisation curve is the graph plotted between magnetic flux density (B) and magnetising force (H). The B-H curve indicates the manner in which the magnetic flux density varies with the change in magnetising force. The following figure shows the general shape of B-H curve of a magnetic material.

What is hysteresis example?

Hysteresis means slow to respond, lagging, a retardation of an effect when the forces that act upon a body are changed. In economics, it refers to the delayed effects of something. For example, as unemployment rises, people get used to a lower standard of living.

What is hysteresis Quora?

Hysteresis means a change in the transfer characteristics of a circuit, usually amplifier circuits. It is particularly useful when you have a comparator amplifier that compares the voltage between its two inputs and then decides an output based on the result.

What is meant by hysteresis in chemistry?

Hysteresis is defined as the deviation of the contact angle from its theoretical (and mean) value due to physical phenomena like microscopic surface defects and roughness.

What is magnetic intensity class 12?

Magnetic Intensity Definition: The degree to which a magnetic field can magnetise a substance or the capability of external magnetic field to magnetise the substance is called magnetic intensity.

What is Curie's law class 12?

According to Curie's Law, the magnetization in a paramagnetic material is directly proportional to the applied magnetic field. If the object is heated, the magnetization is viewed to be inversely proportional to the temperature. The law was discovered by the French physicist, Pierre Curie.

What is hysteresis define coercivity and retentivity?

Hysteresis: The phenomenon of lagging behind the magnetic induction (→B ) with respect to the magnetizing field (→h ) is called hysteresis. Retentivity: The property of the magnetic material to retain magnetism even in the absence of the magnetizing field is known as retentivity or remanence.

What is hysteresis used for?

Hysteresis in analog circuits is useful for controlling switching in circuits with saturation (i.e., transistors), although it is undesirable in some circuits. As an example, hysteresis can be purposefully added to a comparator circuit as it can be used to set the duty cycle of the output waveform.

What is meant by BH curve?

The B-H curve is usually used to describe the magnetization properties of such materials by characterizing the permeability , which is defined as: where and represent the magnetic flux density in tesla (T) and the magnetic field intensity in ampère per meter (A/m), respectively.

What is meant by eddy current?

Definition of eddy current

: an electric current induced by an alternating magnetic field.

What is voltage hysteresis?

Voltage hysteresis is a specific type of hysteresis that occurs in electrical systems when current or voltage changes, but the effects of the changes are delayed past obvious intervals like propagation delays.

What is hysteresis in comparator?

Hysteresis comparator A hysteresis comparator is operated by applying a positive feedback* to the comparator. The potential difference between the High and Low output voltages and the feedback resistor are adjusted to change the voltage that is taken as a comparison reference to the input voltage for the +IN terminal.

How is magnetism an example of hysteresis?

Magnetic hysteresis occurs when an external magnetic field is applied to a ferromagnet such as iron and the atomic dipoles align themselves with it. Even when the field is removed, part of the alignment will be retained: the material has become magnetized. Once magnetized, the magnet will stay magnetized indefinitely.

What causes hysteresis effect?

In nature hysteresis effects are often caused by phase transitions which are accompanied by abrupt changes of some of the involved physical quantities, as well as by the absorption or release of energy in the form of latent heat.

What is coercive field Class 12?

Coercivity is a measurement of a ferromagnetic substance's ability to withstand an external magnetic field without getting demagnetized. The units in which coercivity is measured is ampere per meter and denoted as overset. It's also known as coercive force or coercive field.

What is coercive force?

Definition of coercive force

: the opposing magnetic intensity that must be applied to a magnetized material to remove the residual magnetism.

What is Meissner Effect Class 12?

Meissner effect is the expulsion of the magnetic field from the interior of the superconducting material before its transition from the normal state to the superconducting state.

Who discovered Meissner effect?

The Meissner effect, a property of all superconductors, was discovered by the German physicists W. Meissner and R. Ochsenfeld in 1933.

What is Curie temperature formula?

The curie law states that in a paramagnetic material, the material's magnetization is directly proportional to an applied magnetic field. But the case is not the same when the material is heated. When it is heated, the relation is reversed i.e. the magnetization becomes inversely proportional to temperature. χ = C/T.