Science Homework Help of Magnetism

Introduction on science homework help of magnetism:

Magnetism is the property by the virtue of which any substance gets attracted to iron, both ferrous or ferrite but not its alloys. Every magnet has a dipole, i.e. north and south poles. In fact our earth is a big magnet and tends to magnetize anything which lies in it for a considerable amount of time and hence the discovery of magnet. Magnet when initially discovered was known as lodestone, and it helped in guiding to proper direction.

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Magnetic lines of force of magnetism:


Magnets can be both natural magnets as the lodestone or artificially prepared as the electromagnets. Magnets always give rise to magnetic lines of forces i.e. outward originating from the North Pole and terminating in the South Pole, and an inward movement from the South Pole to the North Pole. This can be successfully depicted by the iron fillings method and the compass needle method.


Demagnetism homework help:


Even natural magnets can be demagnetized very easily and hence proper precaution should be taken in tackling with the same. Some of this methods which can lead to demagnetization are:

By rough handling – Repeatedly dropped or hammered
By heating – Heating to develop magnetic agitation and hence loss in magnetism
Electrical method – Wounding a coil around it, and alternating current is passed
By Induction – Like poles of another magnet are placed in front of each other.
Self demagnetization – Loosing magnetism of its own accord


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Methods of Magnetization:


On can magnetize an iron bar, to behave as a magnet in the following manner:\

Single touch method – Rubbing a magnet over a steel bar
Double touch method – Rubbing 2 magnets over a steel bar, mounted on 2 other magnets. A cork is kept to separate the rubbing magnets.
Divided touch – Same as double touch but the cork is absent.
Electrical – Current is passed  through them in N-S direction
Induction method – Iron bar is brought near a magnet
Thus we see the how magnets can be beneficial in our lives.