Text of Magnets. Section 1: Magnets Magnets and magnetism
Section 1: Magnets and magnetism
1) Any material that attracts iron or materials containing iron
is called a magnet.
-all magnets have two poles, exert forces, and are surrounded by
a magnetic field
2) The parts of a magnet where the magnetic effects are the
strongest are called the poles
4) The force of attraction or repulsion between the poles of
magnets is called the magnetic force.
5) What makes materials magnetic?Moving electrons produce a
magnetic field that gives each atom a north and south pole.In most
elements the fields of individual atoms cancel each other out.In
iron, nickel and cobalt atoms group together in regions called
domains In a domain the atoms line up so that north and south poles
create a strong magnetic field.
Un-aligned domainsAligned domains
6) Types of magnets:
Temporary- domains may be aligned for a short time
Permanent combinations of Aluminum, Nickel and Cobalt.
7) Magnets from Electricity:
Wire wrapped in a coil called a solenoid will generate a
magnetic field when current runs through it
Strength of the field depends on the size of the current and the
number of coils
These types of magnets can be turned OFF
8) Electricity is created using magnets through electromagnetic
Magnets moved through the coil of wire cause the current of
electrons to flow.
Demo magnetic field on overhead*3The pole of a magnet that
points to the north (of Earth) is called the magnets north pole the
other pole is the south pole.
*Like the law of electric charges, opposites attract, likes