Electromagnets

• Middle finger


  Represents the direction of the current
• Iron core


  Increases magnetic field strength of electromagnet
• Solenoid

  Is a Coil of insulated wire
• Wire carrying current


  Creates a magnetic field
• force(N) = Magnetic flux density(T) x Current x Length(M)
• Forefinger


  Represents the direction of the magnetic field
• Number of coils

  Increases the strength of the magnetic field
• Motor effect


  Force created by the interaction between a wire carrying current and another magnetic field. Force is exerted at right angles
• Electromagnet


  Is a solenoid with an iron core
• Fleming's Left Hand Rule used to find direction of force from Motor effect
• Current flowing in a wire creates a magnetic field
• Magnetic field strength

  Greater closer to the electromagnet
• Shape of wire (spiral) creates a strong magnetic field
• Thumb


  Represents the direction of the magnetic force
• Interaction between two magnetic fields

  Can cause a force
• Increasing the current

  Increases the strength of the magnetic field
• Anti-clockwise field means the current is going towards you
• Clockwise field means the current is going away from you