MAGNETISM AND MAGNETIC FIELDS
ARISE FROM THE MOTION OF ELECTRIC CHARGES
Magnetism
- is a class of physical phenomena that include the
attraction for iron observed in lodestone and a magnet, are
inseparably associated with moving electricity, are exhibited by
both magnets and electric currents, and are characterized by
fields of force.
Lodestone
- means leading stone.
2 KINDS OF MAGNET
 PERMANENT MAGNETS
- retain their magnetic properties for a long time.
 TEMPORARY MAGNETS
- only act as magnets as long as they are within the magnetic
field
MAGNETIC FIELD
 This is a region around the magnet where
magnetic effects can be detected.
MAGNETIC FIELD LINES PROPERTIES
 Lines of force originate from the north pole to south pole
 Lines can never across each other
 If lines are closer top one another, the magnetic field is stronger.
Magnetic field lines between the
opposite poles of bar magnets
The magnetic field lines between
similar poles of bar magnets.
NEUTRAL POINT
NEUTRAL POINT
- is a point in a combined
magnetic field where there is
no magnetic effect.
USES OF MAGNETS