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Magnetic Materials & Electromagnetism (Electromagnetism (Current…
Magnetic Materials & Electromagnetism
Magnetic materials
Magnetic
Paperclip - steel/iron
Batteries - nickel
Glass - cobalt
Non - magnetic
Ceramic
Gold
Aluminum
Glass
Copper
Stone
Plastic
Wood
Permanent magnet - always a magnetic e.g bar magnet
Magnetic field
Magnetic field lines are the space around a magnet where magents can attract magnetic material field is strongest when lines are cloest together
Field line rule
Magnetic field lines of force show the shape of the magnetic field, the direction of the field line - north to south, the strength of the magnetic field. Closer together = stronger
Electromagnetism
Current through a wire
Causes a magnetic field
Iron fillings line up with direction of magnetic field
Plotting compass
Plotting compasses show direction of magnetic field
Direction of magnetic field depends on direction of current
Strength of magnetic field
Strength of magnetic field depends on size of current
Strongest cloest to the field & weaker with increasing distance
Iron core
Coil of wire with the electrcity flowing through
Iron core makes electromagnet stronger
Iron because temporary magnet when in magnetic field