7.1.1 Magnetic Fields

• What is a magnetic field?

  Region with magnetic force
• What are the units used to measure the strength of a magnetic field?

  Tesla or N/A⋅m
• What do magnetic field lines show about a magnetic field?

  Direction and strength
• What do dense magnetic field lines indicate about the strength of the magnetic field?

  Stronger field
• Match the property with the correct field:

  Strength measured in Tesla ↔️ Magnetic Field

  Strength measured in V/m ↔️ Electric Field
• What is shown in a diagram of magnetic field lines around a bar magnet?

  Direction and strength
• The source of a magnetic field is stationary electric charges.

  False
• Magnetic fields are represented by magnetic field lines
• Magnetic field lines are circular around current.


  True
• Magnetic field lines flow from the north pole to the south
• Magnetic field lines can cross each other.

  False
• Ordering the flow of magnetic field lines outside a magnet:

  1️⃣ North pole

  2️⃣ South pole
• The strength of a magnetic field is measured in tesla
• Match the property with the correct field:

  Moving electric charges ↔️ Magnetic Field

  Stationary electric charges ↔️ Electric Field
• A magnetic field is a region in space where a magnetic force can be detected.
• What do denser magnetic field lines indicate about the magnetic field?

  Stronger field
• Magnetic field lines outside a magnet run from the north pole to the south pole.


  True
• The strength of a magnetic field is measured in tesla or newtons per ampere-meter
• What do magnetic field lines show about a magnetic field?

  Direction and strength
• Magnetic field lines outside a magnet run from the north pole to the south pole.
• What are the units for measuring the strength of a magnetic field?

  Tesla (T) or N/A·m
• Magnetic fields are produced by stationary electric charges.

  False
• Match the property with the correct field type:

  Source ↔️ Moving electric charges (current)

  Direction ↔️ Circular around current

  Strength Unit ↔️ Tesla (T)
• Match the property with the correct field type:

  Source ↔️ Moving electric charges (current)

  Direction ↔️ Circular around current

  Strength Unit ↔️ Tesla (T)
• A magnetic field is a region of space where a magnetic force can be detected.
• What is the SI unit for measuring the strength of a magnetic field?

  Tesla (T)
• Stationary electric charges produce magnetic fields.

  False
• Steps to identify the North and South poles of a magnet:

  1️⃣ Use a compass

  2️⃣ Interact with another magnet

  3️⃣ Suspend the magnet

  4️⃣ Sprinkle iron filings
• Sprinkle iron filings around the magnet to see where they concentrate, indicating pole positions
• A compass needle points to the North pole of a magnet.

  False
• Why does a compass needle point towards the South pole of a magnet?

  Opposite poles attract
• Like magnetic poles repel, and unlike poles attract.
• When freely suspended, a magnet aligns with Earth's magnetic field.


  True
• What do iron filings indicate when sprinkled around a magnet?

  Pole positions
• Match the method with its result for identifying magnetic poles:

  Compass ↔️ Needle points to South pole

  Interaction with other magnets ↔️ Repulsion means like poles

  Suspension ↔️ North pole aligns with Earth's North

  Iron Filings ↔️ High concentration near poles
• When a magnet is freely suspended, its North pole aligns with the Earth's North magnetic pole
• Iron filings concentrate around the poles of a magnet, indicating areas of strongest magnetism.

  True
• What are three examples of materials used in permanent magnets?

  Ferrite, Neodymium, Samarium-Cobalt
• Induced magnetism occurs when a material becomes magnetic due to an external magnetic field
• Induced magnetism is permanent and does not require an external magnetic field.

  False