magnetism

• What materials are affected by a magnetic field?

  Materials like iron
• What do the field lines in a magnetic field represent?

  • Direction of magnetic force
  • Spread from North (N) to South (S) pole
  • Form a complete loop
• How does the magnetic field around a bar magnet behave?

  • The magnetic field lines emerge from the north pole and re-enter at the south pole
  • The field lines are strongest near the poles and weaker further away
  • The field lines form closed loops around the magnet
• How do the magnetic field patterns differ between unlike pole attraction and like pole repulsion?

  • Unlike pole attraction: Magnetic field lines point from N to S
  • Like pole repulsion: Magnetic field lines point away from each pole
• What are the labels on the two ends of the object in the image?

  S and N
• What do the arrows around the object in the image represent?

  Magnetic field lines
• What builds on the concept of magnetic fields being invisible regions?

  The properties of magnetic field lines
• What do magnetic field lines always form?

  Complete loops from North to South pole
• What are the key features of a magnetic field?

  • Originates from a magnetic source (e.g. magnet, electric current)
  • Exhibits field lines that form closed loops
  • Stronger near the magnetic source, weaker further away
  • Exerts a force on magnetic materials and moving electric charges
  • Can be visualized using iron filings or a compass
• If you had two bar magnets and placed them so that their north poles were facing each other, what would happen?

  The north poles would repel each other
• What are the poles of a magnet called?

  North (N) and South (S) poles
• What are the key differences between a permanent magnet and an electromagnet?

  Permanent magnet:

  • Produces a constant magnetic field
  • Made of magnetic materials like iron, nickel, cobalt

  
  

  Electromagnet:

  • Produces a magnetic field only when electric current flows through it
  • Can be turned on and off
  • Strength can be controlled by adjusting the current
• How does unlike pole attraction work in a magnetic field?

  • The magnetic field lines point from the north pole to the south pole
  • Opposite poles (N and S) are attracted to each other
  • This creates a pull between the two poles
• Where are force lines denser in a magnetic field?

  Near the poles
• What is the significance of the complete loop formed by magnetic field lines?

  It indicates the continuity of the magnetic force
• If the central symbol represents the north pole of a magnet, which direction would the south pole be located?

  Opposite the north pole
• What are the two types of magnetic pole attraction shown in the image?

  Unlike pole attraction and like pole repulsion
• How does like pole repulsion work in a magnetic field?

  • The magnetic field lines point away from each pole
  • Same poles (N and N or S and S) are repelled from each other
  • This creates a push between the two poles
• What is the relationship between the magnetic field lines around a bar magnet?

  No lines cross each other
• Where do magnetic field lines end when drawn around a bar magnet?

  South pole
• What do the arrows in the magnetic field diagram represent?

  The flow of magnetic field lines
• What is the starting point for drawing magnetic field lines?

  North pole
• What are the key features of the magnetic field lines around a bar magnet?

  1. Lines are densest near poles
  2. Form complete loops
  3. No lines cross each other
  4. Spread out further from magnet
  5. Ovals are symmetric
• How can the direction of a magnetic field be determined?

  • Use a compass: the north pole of the compass will point in the direction of the magnetic field lines
  • Apply the right-hand rule: if the fingers of the right hand are curled in the direction of the current, the thumb will point in the direction of the magnetic field
• What is true about the loops formed by magnetic field lines?

  They form complete loops
• If you wanted to create a stronger magnetic field, would you use a permanent magnet or an electromagnet?

  Electromagnet
• How does the magnetic field around a bar magnet behave?

  • The magnetic field lines emerge from the north pole and re-enter at the south pole
  • The field lines are strongest near the poles and weaker further away
  • The field lines form closed loops around the magnet
• What are the key differences between a permanent magnet and an electromagnet?

  Permanent magnet:

  • Produces a constant magnetic field
  • Made of magnetic materials like iron, nickel, cobalt

  
  

  Electromagnet:

  • Produces a magnetic field only when electric current flows through it
  • Can be turned on and off
  • Strength can be controlled by adjusting the current
• What do the arrows around the object in the image represent?

  Magnetic field lines
• What do the field lines around a bar magnet represent?

  The shape of the magnetic field
• What is the symbol shown in the center of the image?

  N
• Where are magnetic field lines closest together and why?

  Near the poles, where magnetic force is strongest
• What do magnetic field lines indicate?

  Direction of magnetic force
• What does the direction of magnetic field lines indicate?

  How a compass needle would point
• From which pole do magnetic field lines flow outside a magnet?

  From the North pole
• How do magnetic field lines form continuous loops?

  • Flow from North to South outside the magnet
  • Flow from South to North inside the magnet
  • Create a closed loop structure
• What is the symbol shown in the center of the image?

  N
• How can the Earth's magnetic field be used for navigation?

  • The Earth's magnetic field allows compasses to point to the north magnetic pole
  • This allows for navigation and orientation on the Earth's surface
  • Magnetic field lines can be used to determine direction and location
• What is the relationship between the poles of a bar magnet?

  Like poles repel
• What do the arrows around the central symbol represent?

  Magnetic field lines