Permanent and induced magnetism

• Magnetic forces can be attractive or repulsive
• If two of the same pole (like poles) are brought together, they repel each other.
• If two different poles (unlike poles) are brought together, they attract each other.
• Magnetic forces are strongest at the poles of a magnet.
• Magnetic forces of attraction and repulsion are non-contact forces.
• Magnets can be permanent or induced.
• Permanent magnets make their ownmagnetic field.
• An induced magnet is a material thatbecomes magnetic when put in a magnetic field.
• Examples of magnetic materials include iron, steel, cobalt and nickel
• Magnetic materials are always attracted to magnets and are never repelled by magnets.
• If a magnetic material is removed from a magnetic field it quickly loses its magnetism
• A magnetic field is a region where magnets or magnetic materials experience a magnetic force
• A magnetic field is shown by field lines.
• The closer together the field lines are, the stronger the field.
• The magnetic field strength is greatest at the poles of a magnet.
• Compasses that are not placed near to a magnet always point north.
• The Earth's core contains iron and nickel, which are magnetic materials that produce the field.
• Magnetic field lines always point from north to south, so the left end must be a north pole