# Magnetism

```Magnetism
 also called lines of force
APPLICATIONS OF MAGNET
MAGNETIC FLUX
Motors, generators,  telephones,  relays, 
loudspeakers,  computer hard drives and
floppy disks,  anti-lock brakes,  cameras, 
fishing reels,  electronic ignition systems, 
keyboards,  t.v.  radio components, 
Transmission equipment.
 the amount of magnetic field (or number of
lines of force) produced by the magnetic source
WHAT IS A MAGNET?
A magnet is a material or object that produces a
magnetic field.
A permanent magnet is a piece of ferromagnetic
material (such as iron, nickel or cobalt) which
has properties of attracting other pieces of these
materials.
It has two poles, North and South
MAGNETIC FIELD
 area around the magnet
 a force that exists around the magnet
 symbol is phi (ф)
 Unit is weber (Wb)
NOTE: 1 x 10^8 lines of force or magnetic field
lines = 1 Weber
MAGNETIC FLUX DENSITY
 the amount of flux passing through a defined
area that is perpendicular to the direction of the
flux.
 Symbol is B
 Unit is Tesla (T)
 Formula B = ф / A
 NOTE: 1 Tesla = 1Weber/m^2
```