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- Disorder. Each unit cell has its own dipole moment, which, when there is a net polarisation, are described as ordered. At high T, the direction of the dipole moments randomises, giving a disordered material with no net polarisation.
- Phase transitions that can open up new possibilities for dipole moments to form. In this case, there is a jump at 0°C, and at 90°C, where the loop becomes taller.
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What happens when there is a change in the magnetic field in a closed loop of wire?
It produces a current.
Does a burning fruit loop involve energy transformation?
Yes,matter can not be created of destroyed but only change its form.
How temperature transmitter work?
A temperature transmitter works by connecting to it some form of temperature sensor. For example a RTD (Resistance temperature device) or Thermocouple. In the case of a RTD connected to the transmitter the transmitter measures a change in resistance of the RTD proportional to the change in temperature measured. The transmitter then derives a current output (generally 4-20mA) which can be measured by an instrument, such as a PLC, loop indicator ect. In the case of a thermocouple a Milli voltage is produced at a junction of two dissimilar metals, this change in Milli voltage again proportional to the change in temperature and the transmitter again derives a current output measurable by a instrument. The transmitter will be ranged by a programming device, say for example an application where process temperatures need to be measured between 0-100 degrees, the transmitter will be ranged 0-100 degrees and thus give an output proportional to the temperature measured by the sensing element. 0 degrees = 4mA, 100 degrees = 20mA. A excitation supply will be connected to the transmitter and the 4-20mA will flow in this loop back to the measuring instrument. It is necessary to use the correct type of sensor for the application to get the best accuracy when measuring. RTD's are generally used for measuring lower temperatures where as thermocouples are used for measuring higher temperatures. There are several types of RTD's such as 2 wire, 3 wire and 4 wire and an even greater range of thermocouples depending on the temperatures and measuring environment.
What is an animation loop?
a loop of an animation or when at the end, it repeats on forever or until program makes it stop. until that point( if there in a point) it's on a loop
What law states that emf is enduced in a loop of wire is proportional to the rate of magnetic flux through the coil?
That is Ampere's law. The emf in a loop is proportional to the rate of change of the magnetic flux.Mathematically Curl E = -dB/dt and the emf comes from applying Stokes's theorem to the surface integral of B.
What is hysteresis loop in stress and strain?
the leading or lagging between the stress and strain is called hysteresis loop
How can you measure the hysteresis loop of the ferroelectric materials and what is the name of the instruments used for the measurements of the hysteresis loop?
it is agm or vsm
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
Formula of Hysteresis loss and Eddy current loss?
hysteresis loss = N1/N2 R2/R1 C1/A1 (area of the loop)(vertical sensitivity) (horizontal sensitiivity
The area of hysteresis loop in a ferromagnetic material of?
this area represent the energy lost per cycle in ferromagnetic material during the magnetization process by hysteresis and in some cases also by eddy current magnetic losses and electric losses
How do you determine the work done in a ferromagnet in going round a hysteresis loop?
When a hysteresis loop is plotted on a graph ( X: Current, Y: Magnetic Field Strength ) for the core of any substance, the area covered by the loop (on both sides of the x-axis) will give the total energy involved or work done in one cycle of magnetisation and demagnetisation.
How do you select core in Transformer Design?
The material used in the manufacture of transformer cores must have a hysteresis loop with a very small area, as it is the area of the hysteresis loop that determines the hysteresis losses of the core material. The core material should also be resistive, in order to reduce eddy current losses (which is further improved by laminating the core). Many transformer manufacturers use their own variations on what is basically a silicon-steel.A hysteresis curve, or loop, is a graph of flux density plotted against magnetising force, and basically describes the ease (or difficulty) with which the core material can be magnetised and demagnetised as the magnetising current changes magnitude and direction.
What do you mean by hysteresis?
A hysteresis loop is when the threshold to make a change in a system is different than the threshold to undo the change. Typically, in an op amp used as a switch, this is done with a small positive feedback, reducing the chance of oscillation when the input is near one of the two thresholds.
What is hysteresis calibration loop?
In hysteresis materials it represents the energy dissipated in them during the cycle of magnetization & demagnetization (just refer any hysteresis loop diagram) . This is used in many applications especially in aerospace to damp the oscillations in satellite.
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.
How do you reduce the hysteresis loss?
Hysteresis losses are a function of the magnetic characteristics of the magnetic circuit, so there is very little you can do to minimise hysteresis losses other than to reduce the primary voltage to a transformer if that is at all practicable. These losses are really in the hands of the manufacturers who design and manufacture magnetic circuits.
What is the significance of looping?
In hysteresis materials it represents the energy dissipated in them during the cycle of magnetization & demagnetization (just refer any hysteresis loop diagram) . This is used in many applications especially in aerospace to damp the oscillations in satellite.
