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De-Magnetisation: Place in a field of alternating current; usually produced by a solenoid, and remove slowly out of the field.
Magnetisation: Swipe with one end of a magnet until the iron/steel bar is magnetised. You can use many magnets if you want to speed up the process. The strongest magnets are created by wrapping coils around the bars, and inducing alternating current in these wires using a power source.
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What is demagnetisation?
the process of which the magnetization of a magnet is removed
Why should the material used for making permanent magnets have high coercivity?
The material should have high retentivity so that the magnet is strong and high coercivity so that the magnetisation is not erased by stray magnetic fields
List and describe three methods of nonpoint and pollution control?
list and describe three methods of nonpoint pollution control
What is a similarity to relative and absolute dating?
They are both methods of discovering the age of an object.They both are methods used in archaeology and geology.
What methods are there for controlling flooding?
get a giant plug
What is demagnetisation?
the process of which the magnetization of a magnet is removed
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 determine if the motor starters are properly earthed?
by magnetisation of no voltage coil
Is there a limit to magnetisation and why?
Yes, there is. To overly-simplify matters, magnetisation relies on the amount of coherently orientated unpaired electrons that exist in the material. This amount is obviously not infinite (because the material only has so many electrons, unpaired or otherwise) and so will hit a cap for the material in question. There are many types of magnetisation and all sorts of intricacies exist but this is a good way to look at it.
What is reversal of magnetisation of steel core?
look up motor polling on the net.
Is magnetisation the same as magnetism?
Magnetization is the process of inducing magnetism in a paramagnetic metal.
Define intensity of magnetization?
Intensity of magnetisation:-intensity of magnetisation is the magnetic movement per unit volume
How can you show that iron pieces are attracted by a magnet?
we can show it by experimenting. for eg. iron (which prevents self demagnetisation) also attracts magnets
What is iron loss of the transformer?
'Iron losses' is the name given to the combination of hysteresis losses and eddy-current losses, which occur in the core of a transformer.Hysteresis losses are energy losses associated with the continual magnetisation and demagnetisation of the core, as characterised by the core's B-H* loop -the larger the area of this loop, the greater the losses.Eddy-current losses are energy losses due to circulating currents resulting from voltages induced into the core by the windings.[*B = flux density expressed in teslas; H = magnetic field strength expressed in amperes per metre.]
If you'r banging the nail will the magnetisation reduce?
Because the domains get muddled up and eventually return to a random order.
Can compounds be separated without chemicals?
Yes!!! Thermal decomposition. Filtration Magnetisation (iron) Evaporation. All are physical processes.
What is hysteresis loss in transformers?
Hysterisis losses are the losses which are taking place in the iron or steel core due to reversal of magnetisation of steel core.
