Permanent Magnets
A permanent magnet is an object made from a material that is magnetized and creates its own persistent magnetic field. This magnetic field is caused by the motion of electrons within the material.
Properties of Permanent Magnets
Permanent magnets have the following properties:
- They attract ferromagnetic materials such as iron, nickel, and cobalt.
- They have two poles - a north pole and a south pole.
- Like poles repel each other, while opposite poles attract each other.
- They can retain their magnetism for a long time if not subjected to external factors that can demagnetize them.
Magnetic Materials
Common materials that can be used to make permanent magnets include:
Applications of Permanent Magnets
Permanent magnets are used in various everyday applications, such as:
- Electric motors and generators
- Speakers and headphones
- Magnetic resonance imaging (MRI) machines
- Magnetic compasses
Study Guide Questions
- What is a permanent magnet and how does it create a magnetic field?
- What are the properties of permanent magnets?
- Which materials can be used to make permanent magnets?
- What are some common applications of permanent magnets?
◂Science Worksheets and Study Guides Third Grade. Relationships among living things
Study Guide
Relationships among living things 
Activity Lesson
Relationships Among Living Things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Worksheet/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things Vocabulary/Answer key
Relationships among living things
Activity LessonWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyWorksheet/Answer keyVocabulary/Answer keyVocabulary/Answer keyThe resources above cover the following skills:
LIFE SCIENCE
From Molecules to Organisms: Structures and Processes
Create representations to explain the unique and diverse life cycles of organisms other than humans (e.g., flowering plants, frogs, butterflies), including commonalities such as birth, growth, reproduction, and death.
Unity and Diversity
Construct an argument from evidence to explain the likelihood of an organism’s ability to survive when compared to the resources in a certain habitat (e.g., freshwater organisms survive well, less well, or not at all in saltwater; desert organisms survive well, less well, or not at all in woodlands).
Create models that illustrate how organisms and their habitats make up a system in which the parts depend on each other.