Magnetism
1. A permanent magnet is a device that retains a magnetic field without need for a power
source. Though many of us have experienced the effects of magnetism from a permanent
magnet, very few people can describe what causes permanent magnetism. Explain the
cause of permanent magnetism, in your own words.
_When the magnetic field is generated by the internal parts of the magnet. It is caused by
electrons within atoms of an object spinning uniformly in the same direction.
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A permanent magnetic is created with a ferromagnetic material, when it is affected by
either a single or double touch procedure, which results in all the electrons being directed
in a certain direction (which is dependent upon the poles of the intended magnet).
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2. If we were to trace the magnetic lines of field extending from this bar magnet, what
would they appear like?
3. Magnetic poles are designated by two labels: “North” and “South”. How are these labels
defined? Explain how we can experimentally determine which ends of a magnet are
“North” and “South”, respectively?
The needle of a compass usually points towards the north pole.
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4. The diagram shows two bar magnets.
They produce a uniform magnetic field. On the diagram, sketch the part of the field that
is uniform an label the poles.
5. Describe an experiment to investigate the shape of the magnetic field pattern around a bar
magnet. You may draws diagram to help your answer.