Magnetism and Electromagnetism

• A compass needle is attracted to the north end of a bar magnet, indicating that it has a south pole at its north end and a north pole at its south end.
• permanent magnets are magnets that produce it's own magnet field
• Induced magnets become magnetised when it's in a magnetic field
• induced magnets always have an attraction to permanent magnets, but not the other way around
• Cobalt, Iron and Nickel are magnetic material
• The strength of a magnetic force depends on how close the object is to the magnet
• the closer the object is to the magnet, the stronger the magnetic force will be
• magnetic material can become induced and are attracted to permanent magnets
• Electromagnet is when the current flows through a conducting wire and a magnetic field is produced around the wire
• A solenoid is a coil of wire used to produce a magnetic field
• increasing a magnetic field : increasing current, increasing number of turns, adding iron core to the centre (electromagnet)
• The motor effect is a current carrying wire creating a magnetic field and causes a force that pushes the wire at a right angle
• Force = Magnetic flux x current x length