KS3 MAGNETS AND ELECTROMAGNETS

• What are the three magnetic elements?

  Iron, cobalt, and nickel
• Where are magnetic elements found in the periodic table?

  Within the transition metals
• What is steel made of?

  Iron and carbon
• Why is steel magnetic?

  Because it contains iron
• What are the two poles of a magnet called?

  North Pole and South Pole
• What happens when opposite poles of magnets are near each other?

  They attract each other
• What happens when like poles of magnets are near each other?

  They repel each other
• What do magnetic field lines indicate?

  The direction of the magnetic field
• How do magnetic field lines behave around a magnet?

  They point from north to south
• What does the density of magnetic field lines indicate?

  The strength of the magnetic field
• How can magnetic field lines be visualized?

  Using plotting compasses or iron filings
• What do plotting compasses show around a magnet?

  The direction of the magnetic field lines
• What happens to iron filings around a magnet?

  They align along the magnetic field lines
• What occurs when opposite poles of two magnets come together?

  They attract each other
• What happens when like poles of two magnets are brought together?

  They repel each other
• What shape can magnets take besides bar magnets?

  U-shaped magnets
• How does the Earth's magnetic field behave?

  It acts like a bar magnet inside the Earth
• Where is the South Pole of the Earth's magnetic field located?

  At the geographic North Pole
• Where is the North Pole of the Earth's magnetic field located?

  At the geographic South Pole
• How does a compass work?

  It points to the Earth's magnetic South Pole
• What does a compass needle indicate when navigating?

  The direction of geographic North
• How does the compass needle behave when on the Earth's surface?

  It points towards the magnetic South Pole
• What do magnetic field lines around a magnet point from?

  North to south
• What is the relationship between the compass needle and the Earth's magnetic field?

  The needle aligns with the magnetic field
• What happens when a current flows through a wire?

  A magnetic field is produced
• What is the purpose of a compass in navigation?

  To find geographic North
• How does the direction of current affect the magnetic field around a wire?

  It determines the direction of the field
• What does a coil of wire produce when current flows through it?

  A magnetic field similar to a bar magnet
• What happens when you hold a compass at a specific point on Earth?

  The compass needle points towards magnetic South
• What is an electromagnet?

  A coil of wire producing a magnetic field
• What does the term "electromagnet" signify?

  Electricity and magnetism combined
• How does the compass needle behave when navigating on different sides of the Earth?

  It always seeks the South Pole of the field
• What happens to an electromagnet when it is switched off?

  It loses its magnetism
• How can you increase the strength of an electromagnet?

  Increase the number of turns on the coil
• What is the website mentioned for finding videos?

  GCSE revision monkey
• What effect does increasing the current have on an electromagnet?

  It increases the strength of the electromagnet
• What is the purpose of the Science surgery package?

  It contains revision resources
• What can be adjusted to increase the current flowing through the wire?

  The potential difference of the power supply
• What happens when you add an iron core to a coil of wire?

  It increases the strength of the electromagnet
• How can you investigate the effect of the number of turns on an electromagnet's strength?

  • Use different electromagnets with varying turns
  • Measure the number of nails or paperclips picked up
  • Keep potential difference and core material constant