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Magnetism Tutorial

2018-01-24 01:18  
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Some irons, when dug up, attract other metals. They are calledMAGNETS. The reason that they are magnetic is that theirDOMAINSare aligned.


One end of a bar magnet is theNORTH POLE, the other end theSOUTH POLE.

A rule of magnetism is thatLIKE POLES REPEL, UNLIKE POLES ATTRACT. North attracts South and repels North etc. The North pointer on a compass is actually a South pole since it is attracted by the North pole of the earth.

A magnet is surrounded by an invisibleMAGNETIC FIELDmade of magneticLINES OF FORCE. 
These lines of force can be made visible by covering a magnet with a sheet of paper and sprinkling iron filings on the paper.

MAGNETISM Force North to South Diagram

The lines of force run from north to south.

Lines of force pass through all materials including insulators.  They pass through some more easily than others. These are said to have a lowerRELUCTANCE.  Iron has a lower reluctance than air.

The lines of force prefer to pass through lower reluctance materials.

Magnetism Air Soft Iron North South Diagram

PERMANENTmagnets are made of steel or steel alloys. Brass, copper and aluminum do not magnetize.

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