P1 magnetism and electromagnetism

• What are the two poles of a magnet?

  North and South
• How do the different poles of a magnet interact?

  Like poles repel, unlike poles attract
• What is a permanent magnet?

  A magnet that produces its own magnetic field
• What are the characteristics of a permanent magnet?

  • Produces its own magnetic field
  • Attracts and repels other magnets
  • Made from magnetic material
  • Cannot be demagnetised
• What is a hard magnetic material?

  Magnetised permanently when external field is applied
• Name four magnetic materials.

  1. Iron
  2. Cobalt
  3. Nickel
  4. Steel (Iron + Carbon)
• What is a soft magnetic material?

  Demagnetised when external field is removed
• What is a magnetic field?

  A region where magnets experience a force
• Which direction do the field lines in a magnetic field point?

  From north to south
• Does a high concentration of field lines mean the field is strong or weak?

  Strong
• True or false? Magnetic field lines never cross each other.

  True
• How can you produce a uniform magnetic field?

  By placing opposite poles of two magnets together
• How is a plotting compass used to map out a magnetic field?

  • Place compass on paper near the field
  • Move compass to different positions
  • Draw arrows in direction of needle
  • Join arrows to create field pattern
• What must happen for a magnetic field to be created around a wire?

  Current must flow through the wire
• What does Fleming’s Left Hand rule represent?

  Force, Magnetic field, Current

  
• What is the relationship between current, magnetic field, and force?

  • They all act perpendicular to each other