PHYSICS: Magnetism & Electromagnetism

• What is magnetism due to?

  Magnetism is due to the magnetic fields around magnets.
• How can magnetic fields be investigated?

  By looking at the effects of the forces they exert on other magnets and magnetic materials.
• What are the two poles of a magnet?

  • North pole: Attracted to the Earth's magnetic north pole.
  • South pole: Attracted to the Earth's magnetic south pole.
• Where is the magnetic force strongest on a magnet?

  The magnetic force is strongest near the magnet's poles.
• What happens when like poles of magnets are brought together?

  • Like poles (N-N or S-S) repel each other.
• What happens when unlike poles of magnets are brought together?

  • Unlike poles (N-S or S-N) attract each other.
• What type of forces are magnetic forces?

  Magnetic forces are non-contact forces.
• What does it mean that magnetic forces are non-contact forces?

  It means that magnets affect each other without touching.
• What is an induced magnet?

  • An object that can be magnetized or attracted to a magnet.
• What is a permanent magnet?

  • An object that is always magnetic and does not lose its magnetism easily.
• What is the purpose of cookies on a website?

  To give the best online experience
• What should users do if they agree to cookies?

  Let the website know they agree to all cookies
• What are some of the subjects covered in Bitesize?

  All subjects including Science, Maths, and English
• What is the significance of magnetic fields in magnetism?

  They exert forces on other magnets and magnetic materials
• Which materials are considered magnetic?

  Iron, steel, nickel, and cobalt
• What is a permanent magnet?

  A magnet made from a magnetic material that cannot be turned off
• What are examples of permanent magnets?

  Bar magnets and horseshoe magnets
• How does an induced magnet differ from a permanent magnet?

  An induced magnet only becomes a magnet in a magnetic field
• What happens to induced magnetism when the magnet is removed from the magnetic field?

  It is quickly lost
• What can a permanent magnet do to another permanent magnet?

  It can attract or repel it
• How can you determine if an object is a permanent magnet?

  By checking if it repels another magnet
• What are the key features of a permanent magnet?

  • Produces its own magnetic field
  • The magnetic field cannot be turned on and off
  • Always exerts a force on other magnets or magnetic materials
• What are the characteristics of induced magnets?

  • Become magnets only in a magnetic field
  • Are attracted by other magnets
  • Lose magnetism when removed from the magnetic field
• What are the testing methods for magnetism?

  • A permanent magnet can attract or repel another permanent magnet
  • It can attract a magnetic material but cannot repel it
• What is magnetism due to?

  Magnetism is due to the magnetic fields around magnets.
• How can magnetic fields be investigated?

  Magnetic fields can be investigated by looking at the effects of the forces they exert on other magnets and magnetic materials.
• What is a magnetic field?

  • Area surrounding a magnet
  • Can exert a force on magnetic materials
  • Invisible but can be detected
• How can a magnetic field be detected?

  A magnetic field can be detected using a magnetic compass.
• What does a compass contain to detect magnetic fields?

  A compass contains a small bar magnet on a pivot.
• In which direction does the compass needle point?

  The compass needle points in the direction of the Earth's magnetic field or the magnetic field of a magnet.
• How can magnetic fields be mapped out using a plotting compass?

  1. Place the plotting compass near the magnet on paper.
  2. Mark the direction the compass needle points.
  3. Move the compass to different positions, marking the needle direction each time.
  4. Join the points to show the field lines.
• What does the needle of a plotting compass point to?

  The needle of a plotting compass points to the south pole of the magnet.
• What is electromagnetism caused by?

  Magnetic fields around electric currents
• How do magnetic fields interact with nearby magnets?

  They can cause forces that make motors spin
• What produces the Earth's magnetic field?

  The Earth's core, made from iron and nickel, produces the Earth's magnetic field.
• What happens when a current flows in a wire?

  It creates a circular magnetic field around the wire
• What are the key features of magnetic field lines around a bar magnet?

  • Magnetic field lines never cross each other.
  • The closer the lines, the stronger the magnetic field.
  • Arrowheads indicate the direction of force from north to south.
• What do the arrowheads on magnetic field lines indicate?

  The arrowheads indicate the direction of the force exerted by a magnetic north pole.
• What can the magnetic field created by a wire do to a magnetic compass needle?

  It can deflect the needle
• From which pole to which pole do magnetic field lines point?

  Magnetic field lines point from the north pole of the magnet to its south pole.