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Ch 15: Magnetism in Physics

About This Chapter

Watch video lessons on magnetism in physics and learn about the surprising relationship between magnetic fields and electrically charged particles. Each lesson is accompanied by a short multiple-choice quiz you can use to check your understanding of these physics topics.

Magnetism in Physics - Chapter Summary and Learning Objectives

This chapter is designed to provide you with an introduction to magnetism, one of the four basic interactions found in the natural world. Along with learning how magnets work, you'll find out how the moving subatomic particles, known as electrons, create magnetic fields. The instructor will also explain the principle of electromagnetic induction, whereby a magnetic field can generate an electromotive force in an electrical conductor.

Electric motors and generators will also be covered, showing how they convert between mechanical energy and electrical energy. You'll also become familiar with the key formulas and laws associated with electromagnetism, such as Maxwell's equations. When you finish this chapter, you should understand the following:

  • How magnetic forces and fields work
  • The relationship between magnetic forces and moving charged particles
  • Faraday's Law of Electromagnetic Induction and how magnetic fields and electrical circuits can create an electromotive force
  • How Biot-Savart's equation can be used to calculate a magnetic field created by an electrical current
  • Ampere's circuital law and the relationship between electrical currents and magnetic fields
  • The real-world applications of electrical currents and magnetism

VideoObjectives
Magnetic Force: Definition, Poles and Dipoles Explain magnetic force, including how like poles repel, opposite poles attract and how poles always exist in pairs.
What is a Magnetic Field?Describe magnetic fields, including the shape and direction of field lines. Consider why magnetic field strength is strongest at the poles. Examine magnetic domains in natural magnets and other materials that can be magnetized.
How Magnetic Fields Are CreatedExplain how magnetic fields are created by moving charges. Discuss electromagnets and the factors affecting field strength.
How Magnetic Forces Affect Moving ChargesUnderstand how a moving charged particle is affected by a magnetic field, and describe its practical applications.
Electromagnetic Induction: Definition and Variables that Affect InductionUnderstand how a magnet can be used to induce a voltage in a conductor, and examine the variables that affect induction.
Electromagnetic Induction: Conductor to Conductor and TransformersUnderstand how current in one conductor can cause a voltage in another conductor. Discuss the variables that affect induction and how electrical transformers convey energy.
Electric Motors and GeneratorsExamine how electric motors and generators convert between electrical energy and mechanical energy.
Faraday's Law of Electromagnetic InductionDescribe Faraday's experiments and his law of electromagnetic induction.
The Biot-Savart LawDiscuss the Biot-Savart Law.
Ampere's LawExplain Ampere's Law.
Maxwell's EquationsDiscuss and apply Maxwell's Equations.

11 Lessons in Chapter 15: Magnetism in Physics
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.

Electric Motors & Generators: Converting Between Electrical and Mechanical Energy

7. Electric Motors & Generators: Converting Between Electrical and Mechanical Energy

Both generators and electric motors are common devices in everyday life, but how do they work and what is the difference between them? In this lesson, we'll explore both of them, which may produce different results but are actually more similar than they may seem.

Faraday's Law of Electromagnetic Induction: Equation and Application

8. Faraday's Law of Electromagnetic Induction: Equation and Application

Electromagnetic induction allows us to induce voltage with the movement of a magnetic field. Credited to Michael Faraday, this discovery was not only groundbreaking at the time, but it has since led to many applications in everyday life.

The Biot-Savart Law: Definition & Examples

9. The Biot-Savart Law: Definition & Examples

After watching this lesson you will be able to explain what the Biot-Savart Law is, and use the simplified version to solve problems. A short quiz will follow.

Ampere's Law: Definition & Examples

10. Ampere's Law: Definition & Examples

After watching this video, you will be able to explain what Ampere's Law is, and use Ampere's Law for a long, straight, current-carrying wire to solve problems. A short quiz will follow.

Maxwell's Equations: Definition & Application

11. Maxwell's Equations: Definition & Application

After watching this video, you will be able to explain what Maxwell's equations are, the basic principles behind each one, and what benefits they have led to in society. A short quiz will follow.

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