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Magnets - Coggle Diagram
Magnets
What are magnets?
Magnets can be natural or man-made. Naturally occurring magnets may not be very strong.
Magnets have 2 magnetic poles:
Magnets can exert force from a distance (i.e. exert non-contact forces)
North pole (The north-seeking pole)
Substances that attract iron (and iron-like) substances.
South pole (The south-seeking pole)
When suspended freely, magnets always align themselves along the north-south direction.
Like poles of a magnet repel while the unlike poles attract.
Domain theory of ferromagnets:
The direction of magnetisation varies from domain to domain and in the absence of an external magnetic field, the net magnetisation is zero.
Each domain is spontaneously magnetised and is separated from another domain by a domain wall.
In the presence of an external magnetic field, the domains align and the material as a whole behaves as a magnet - responding to the magnetic field.
A ferromagnetic material is divided into large number of small regions called domains.
How do magnets exert forces from a distance?
Each magnet has a ‘magnetic field’ around it.
The interaction of the magnetic field of one magnet with the field of another magnet results in the forces between the magnets.
Only a ‘magnet’ can respond in a ‘magnetic field’
