12.2 Sources of Magnetic Fields

• What are magnetic fields?

  Regions of magnetic force
• Electric currents produce magnetic fields
• What do magnetic field lines represent?

  Direction and strength
• What are the two types of magnetic poles?

  North and south
• Like magnetic poles repel each other.


  True
• Permanent magnets have a constant and relatively strong magnetic field
• What type of poles do magnets have?

  North and south
• In what direction do magnetic field lines point outside a magnet?

  North to south
• Magnetic fields are regions of space where magnetic forces
• What type of poles do magnetic fields have?

  North and south
• The source of magnetic fields can be moving electric charges or magnets
• What causes the magnetic field in permanent magnets?

  Aligned electron spins
• What is an example of a common material used in permanent magnets?

  Alnico
• How do you determine the direction of the magnetic field around a current-carrying wire?

  Right-hand rule
• What is a key characteristic of magnetic field lines?

  Continuous loops
• Magnetic field lines point from the north pole to the south pole.
• Like magnetic poles repel, while opposite poles attract.
• Match the property with its field type:

  Source of magnetic field ↔️ Moving electric charges or magnets

  Source of electric field ↔️ Stationary electric charges
• What type of materials are used to create permanent magnets?

  Iron, nickel, cobalt alloys
• What is the relationship between the strength of the magnetic field and the current in a wire?

  Proportional
• What are the two factors that affect the strength of the magnetic field around a current-carrying wire?

  Current magnitude and distance
• What is the source of magnetic dipoles?

  North and south poles
• Match the electromagnetic phenomenon with its fundamental law:

  Magnetic Fields ↔️ Ampère's Law

  Electric Fields ↔️ Coulomb's Law

  Electromagnetic Induction ↔️ Faraday's Law
• How do moving electric charges generate magnetic fields?

  They align electron spins
• Electromagnetic induction involves the generation of electric fields by changing magnetic fields.


  True
• Magnetic field lines form continuous loops without a beginning or end.

  True
• What causes the magnetic field in permanent magnets?

  Aligned electron spins
• Magnetic field lines point from the north pole to the south pole of a magnet.

  True
• Magnetic field lines always form continuous loops
• What are the two poles every magnet has?

  North and south
• Magnetic field lines have a beginning and an end.

  False
• Match the magnetic property with its description:

  Every magnet ↔️ Has a north and south pole

  Like magnetic poles ↔️ Repel each other

  Earth acts as a ↔️ Giant magnet
• What happens when the north pole of one magnet is brought near the south pole of another magnet?

  They attract
• Match the characteristic of permanent magnets with its description:

  Magnetic Field Strength ↔️ Constant and relatively strong

  Cause of Magnetic Field ↔️ Aligned electron spins in atoms

  Pole Orientation ↔️ Fixed with north and south poles
• The direction of the magnetic field around a current-carrying wire follows the right-hand rule
• Match the property with the correct source of magnetic fields:

  Permanent Magnets ↔️ Aligned electron spins

  Moving Electric Charges ↔️ Electric current in a wire

  Magnetic Field Direction ↔️ Fixed north-south orientation
• Electric currents provide a versatile way to create magnetic fields that can be adjusted through current control
• What is the shape of magnetic field lines outside a magnet?

  Continuous loops
• What are the two types of magnetic poles in a magnet?

  North and south
• What are magnetic fields represented by?

  Magnetic field lines