P4.2 Uses of Magnetism

• What is magnetism defined as?

  Attraction or repulsion due to magnetic properties
• Magnets attract dissimilar poles and repel similar poles.


  True
• Magnets are used in motors to create the rotating magnetic fields
• Match the uses of magnetism with their applications:

  Motors and Generators ↔️ Create rotating magnetic fields

  Data Storage ↔️ Store data on magnetic media

  Speakers and Headphones ↔️ Vibrate diaphragm to produce sound

  Compasses ↔️ Use Earth's magnetic field
• In electric motors, electric current through coils creates a magnetic field that interacts with a permanent magnet
• What are magnetic fields regions around?

  Magnets or electric currents
• What is the phenomenon called where objects attract or repel due to their magnetic properties?

  Magnetism
• Magnetic fields can be created by magnets or electric currents.

  True
• Order the following uses of magnetism in everyday life based on the devices they relate to:

  1️⃣ Motors and Generators

  2️⃣ Data Storage

  3️⃣ Speakers and Headphones

  4️⃣ Compasses and Navigation

  5️⃣ Medical Imaging
• What is the interaction between electric currents and magnetic fields called?

  Electromagnetism
• Generators produce electricity by rotating a coil within a magnetic field.


  True
• In MRI, magnetic fields align the hydrogen protons
• Magnets are objects that attract or repel other magnetic materials
• What are the two poles of a magnet called?

  North and South
• Magnets are used in hard drives to store data.


  True
• What type of medical technology uses magnetic fields to create detailed images of the body?

  MRI
• Rotating a coil within a magnetic field induces an electric current in generators.


  True
• The key properties of magnetic fields include their strength and direction
• The strength and direction of magnetic fields are indicated by field lines
• Match the magnetic property with its description:

  Attraction and Repulsion ↔️ Magnets attract dissimilar poles

  Polarity ↔️ Magnets have north and south poles

  Magnetic Fields ↔️ Magnets create fields around them
• In electric motors, electric current creates a magnetic field that interacts with a permanent magnet
• What type of medical imaging uses strong magnetic fields and radio waves to create detailed images of the body?

  MRI
• Magnetic bearings reduce friction in high-speed machinery by using magnetic fields to support rotating components.


  True