# Magnets

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• Created by: tljg
• Created on: 08-12-15 19:35
• Magnets
• Object which produces a magnetic field.
• A magnetic field is an area of space where magnetic materials feel a force.
• North & South pole.
• Opposites attract (N&S / S&N).
• Similar poles repel (N&N / S&S).
• Always points from north to south.
• 3 Magnetic elements;         Iron (steel)      Nickel            Cobalt
• Methods to show the Magnetic field.
• Place a magnet on a sheet of paper and place a plotting compass at five points at either end of the magnet. Follow the points in the direction of the arrow and join the points.
• Place two magnets 5cm apart underneath a sheet of paper (Repelling / Attracting). Sprinkle iron fillings on the sheet of paper The pattern of the fillings will show the magnetic field
• Electromagnets
• Produce a magnetic field around the wire
• The field produced is weak but can be made stronger by putting magnets together
• Flemmings left hand rule
• You can change the direction of the force by reversing the magnetic field
• HOW CAN WE MAKE THE FORCE BIGGER?
• Use a larger current
• Use a stronger magnet
• Use more wire
• HAND RULE
• ThuMb = Motion
• First Finger = magnetic Field
• SeCond finger = Current
• The electric motor
• Split ring communicator
• Switches the direction of the current so the motor continues to turn in the same direction
• Electrical energy to kinetic energy
• Generators
• KInetic energy to electrical energy
• Needs a magnet, a coil of wire and one needs to be moving.
• The current produced is alternating
• HOW DO YOU MAKE THE VOLTAGE PRODUCED AS BIG AS POSSIBLE?
• More kinetic energy in = More electrical energy out
• Increase the number of coils in the wire
• Increase the size of the coils
• Increase the strength of the magnet
• Use a magnetic material as the core