12.1 Magnets and Magnetic Fields

• What is an example of a temporary magnet?

  Electromagnet
• Properties of magnetic field lines

  1️⃣ Field lines point from the north pole to the south pole outside the magnet

  2️⃣ Field lines never intersect each other

  3️⃣ The density of lines indicates field strength
• A horseshoe magnet generates a focused and strong magnetic field between its poles.


  True
• A horseshoe magnet generates a strong and focused magnetic field between its poles.


  True
• Temporary magnets exhibit magnetic properties only when placed in a magnetic field.


  True
• Arrange the properties of magnetic field lines in the correct order.

  1️⃣ Direction: Field lines point from North to South outside the magnet

  2️⃣ Density: Closer lines indicate a stronger field

  3️⃣ Non-Intersection: Field lines never intersect each other
• The Earth's magnetic field is similar to that of a bar magnet.
• Permanent magnets retain their magnetic properties indefinitely.

  True
• Like magnetic poles repel each other.


  True
• A bar magnet has a uniform magnetic field near its poles
• A bar magnet has a uniform magnetic field near its poles
• Permanent magnets retain their magnetic properties indefinitely
• The magnetic field around a magnet is represented by magnetic field lines
• What is the primary characteristic of a horseshoe magnet's magnetic field?

  Strong and focused
• The Earth's magnetic field protects the planet from harmful solar radiation.


  True
• Magnets are objects that produce a magnetic field
• Magnets have two magnetic poles: a north pole and a south pole.
• What graphically represents the direction and strength of a magnetic field?

  Magnetic field lines
• What graphical representation shows the direction and strength of a magnetic field?

  Magnetic field lines
• What are magnets made of that produce a magnetic field and attract certain metals?

  Iron, nickel, cobalt
• What are the two magnetic poles of a magnet called?

  North and South
• A bar magnet has a stronger magnetic field in the middle compared to its poles.

  False
• What is the direction of Earth's magnetic field lines outside the Earth?

  North to South