Magnetic

• The magnetic field lines represent the lines of force that pass through each point in space, indicating the direction of the field.
• magnet direction is from north to south
• Magnetic materials = object that can be influenced by magnetic fields and have the potential to become a magnet
• Permanent magnets produce their own magnetic field
• Induced magnet have magnetic field temporary
• Induced magnet is either magnetic soft or hard

  soft = lose magnetism quickly such as nickels, iron

  hard - lose magnetism slow such as steel
• when current stops flowing through the coil the magnetic field disappears
• When current flows through the coil it creates a magnetic field around the wire
• Electromagnetism

  Creating magnetic field with current
• • Right hand rule - thumb=direction of current
• • Direction of magnetic field depend on the direction of current flow 
• Ways to increase strength of magnetic field

  • Increase current
  • Increase no. of coil, keep length same
  • Decrease length, keep no of coil same 
  • add iron core into it (iron - soft magnetic material - induced magnet)
• Motor effect

  Current carrying wire with magnetic field experiencing a force
• Electric motor

  Ways to increase speed of rotation 

  • Increase current 
  • Add more turns to coil
  • Increase magnetic flux density (stronger magnets)
• Flemings left hand rule - thumb = direction of force, index finger = direction of magnetic field, middle finger = direction of current