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Ch 7: Magnetism

About This Chapter

Watch natural science video lessons with short, self-assessing quizzes. Learn about the different aspects of magnetism, including the definition of a magnet and how magnets and magnetic fields are formed.

Lessons in Magnetism

Magnets - you know what they are. You have probably played with them before, trying to get them to repel each other. You have probably used them before to hang things on your refrigerator. But, do you really understand how they work or why they are important (other than keeping important papers on the fridge)? If you aren't sure, then this chapter will help you find out the answers to those questions. Our lessons cover magnetic force and magnetic fields. You'll learn about electromagnetic induction, too. Some of the things you will learn in this chapter include:

  • The definition of magnetic poles
  • How magnetic strength is stronger at the poles
  • How magnetic fields are created
  • How particles can be affected by a magnetic field
  • How magnets can be used to create energy
  • Variables that can affect electromagnetic induction

VideoObjective
Magnetic Force: Definition, Poles & Dipoles Discover the concept of magnetic force and see which poles attract and which repel.
What is a Magnetic Field? Explore magnetic fields and learn about field lines, strength and magnetic domains.
How Magnetic Fields Are Created Examine how a magnetic field can be created by moving charges and the factors that can affect field strength.
How Magnetic Forces Affect Moving Charges Analyze how a charged particle that is in motion can be affected by a magnetic field.
Electromagnetic Induction: Definition & Variables that Affect Induction Find out how a magnet can be used to induce a voltage in a conductor.
Electromagnetic Induction: Conductor to Conductor & Transformers Study conductors, variables that affect induction and transformers.

6 Lessons in Chapter 7: Magnetism
Magnetic Force: Definition, Poles & Dipoles

1. Magnetic Force: Definition, Poles & Dipoles

You're probably familiar with magnets, but have you ever stopped to consider how they work? In this lesson, we'll look at the root of magnetism and some of the fundamental properties of magnets.

What is a Magnetic Field?

2. What is a Magnetic Field?

Magnetic fields fill the space around all magnets, but they're impossible to detect with our own senses. We'll use a common tool to map out a magnetic field and then discuss ferromagnetic materials to see how a magnetic field can be used to create new magnets.

How Magnetic Fields Are Created

3. How Magnetic Fields Are Created

Have you ever wondered how magnetic fields are created? In this lesson, we'll discuss the very simple answer to this question and look at how electric current can be used to make electromagnets, which have many everyday applications.

How Magnetic Forces Affect Moving Charges

4. How Magnetic Forces Affect Moving Charges

A magnetic field exerts a force on a moving charged particle in ways that you might not expect. In this lesson, we're going to look at the direction of this force and the factors that affect its strength.

Electromagnetic Induction: Definition & Variables that Affect Induction

5. Electromagnetic Induction: Definition & Variables that Affect Induction

We use electromagnetic induction every day, but do you have any idea what it is? In this lesson, we'll discuss this everyday phenomenon, the factors that affect its strength and its most common applications.

Electromagnetic Induction: Conductor to Conductor & Transformers

6. Electromagnetic Induction: Conductor to Conductor & Transformers

Every day we make use of a special case of electromagnetic induction known as mutual induction. In this lesson, we'll talk about this special phenomenon and how it is used in many common devices.

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