Otis Singleton
The relationship between electricity, magnetism, and light, known as electromagnetism, was first described by James Clerk Maxwell in 1873. Before that, in 1861, Michael Faraday discovered the connection between magnetism and light when he observed that a substance like glass could rotate the plane of polarization of light in the presence of a magnetic field. This phenomenon is known as the Faraday effect. Maxwell's work built on Faraday's discovery and formulated a quantitative theory that linked the fundamental phenomena of electricity and magnetism, predicting electromagnetic waves that travel at the speed of light. This established the concept of electric and magnetic field lines of force and their connection to light.
| Characteristics | Values |
|---|---|
| Relationship | Electricity and magnetism are related by electromagnetism |
| Discovery | James Clerk Maxwell published the theory of electromagnetism in 1873 |
| Speed of light | Maxwell's theory linked electricity and magnetism to the speed of light |
| Electric and magnetic fields | Electric and magnetic fields are perpendicular to each other and to the direction of motion |
| Electric current | Moving charges represent an electric current |
| Magnetic field | A magnetic field is produced around a wire with an electric current |
| Direction of magnetic field | The direction of the magnetic field depends on the direction of the current |
| Induction | Moving a loop of wire towards or away from a magnetic field induces a current in the wire |
| Light | Light is an electromagnetic wave with electric and magnetic components |
| Light and magnetism | Faraday observed that light rotates in the presence of a magnetic field, known as the Faraday effect |
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What You'll Learn
Electric and magnetic fields
The relationship between electricity and magnetism, known as electromagnetism, was first described by James Clerk Maxwell in 1873 in his work, "A Treatise on Electricity and Magnetism". This work included 20 equations, later condensed into four partial differential equations, that detailed the basic concepts of electricity and magnetism.
Every moving electric charge has an associated magnetic field. For example, the orbiting electrons of atoms produce a magnetic field, and there is a magnetic field associated with power lines. Additionally, a magnetic field can induce charged particles to move, producing an electric current. The direction of the current depends on the direction of the movement. This relationship between electric and magnetic fields can be described by Maxwell's equations and the Lorentz force law. Maxwell's equations detail how the electric and magnetic fields influence each other, while the Lorentz force law states that a charge moving through a magnetic field feels a force that is perpendicular to both the magnetic field and its direction of motion.
Together, electric and magnetic fields form an electromagnetic field, which represents the electric and magnetic influences generated by and acting upon electric charges. In an electromagnetic field, the electric and magnetic fields are perpendicular to one another. A disturbance in the electric field can create a disturbance in the magnetic field, which then affects the electric field, leading to an oscillation that propagates through space, known as an electromagnetic wave. Electromagnetic waves, such as light, have both electric and magnetic components that travel in the same direction but are oriented at a right angle to one another.
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Electromagnetic waves
Maxwell's work introduced a set of equations that established the basic principles governing the interactions of electric and magnetic fields. One of his key insights was the realisation that the speed of light and the numerical factor linking electrostatic and magnetic units were very close. This led to the conclusion that light and magnetism are different manifestations of the same underlying phenomenon, and that light is an electromagnetic disturbance.
Maxwell's theory predicted the existence of electromagnetic waves, which consist of oscillating electric and magnetic fields that travel in the same direction but are oriented at a right angle (90 degrees) to each other. These waves propagate through space at the speed of light and exhibit properties such as reflection, diffraction, refraction, and interference.
The experimental generation of electromagnetic waves was later achieved by Hertz, who produced electromagnetic radiation of radio and microwave frequencies. This not only validated Maxwell's theory but also paved the way for technological advancements in the field of radio-frequency electromagnetic radiation, including the development of transmitters, antennas, coaxial cables, and detectors.
The understanding of electromagnetic waves has been instrumental in comprehending the behaviour of light and the intrinsic connection between electricity and magnetism.
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Light as an electromagnetic disturbance
Light is a self-propagating disturbance in the electromagnetic field values. It is a type of electromagnetic radiation, which is produced by the acceleration of charged particles. Light is essentially a change in the electromagnetic field, which is typically caused by accelerating charges or by excited particles relaxing to their ground state.
The electromagnetic field determines how electrically or magnetically charged objects move. Charged objects are affected by the EM field values and experience a force that accelerates them, changing the way they move. Light can be absorbed or emitted by charged objects, even though the path along which it travels is not changed by these objects.
The relationship between electricity and magnetism, known as electromagnetism, was first described by James Clerk Maxwell in 1873. Maxwell's work included 20 equations, which have since been condensed into four partial differential equations. These equations represent the basic concepts of electricity and magnetism, such as the attraction and repulsion of like and unlike charges, the existence of magnetic poles in north-south pairs, and the generation of a magnetic field around a wire carrying an electric current.
While light is considered a type of electromagnetic wave, it does not exhibit electric or magnetic properties. Unlike magnets, which can attract or repel objects, light does not seem to affect magnets. This has led to questions about why light is considered electromagnetic radiation if it does not appear to be electric or magnetic.
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The Faraday effect
The magnitude of the rotation depends on the strength of the magnetic field, the nature of the transmitting substance, and Verdet's constant, which is a property of the transmitting substance, its temperature, and the frequency of the light. Faraday observed that when a beam of polarized light passed through a piece of "heavy" glass in the direction of an applied magnetic force, the polarization of light rotated by an angle proportional to the strength of the force.
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Electric current and magnetic fields
Electricity, magnetism, and light are fundamentally intertwined. Magnetism is the physical phenomenon produced by moving electric charges. A magnetic field can induce charged particles to move, producing an electric current.
The magnetic moment of an atom can be the result of the electron's spin, which is the electron orbital motion, and a change in the orbital motion of the electrons caused by an applied magnetic field. The magnetic field vector B at any point can be defined as the vector that, when used in the Lorentz force law, correctly predicts the force on a charged particle at that point. The force on a negatively charged particle will be in the opposite direction.
The direction of the magnetic field can be determined by the right-hand rule, where you point your right thumb in the direction of the current, and the fingers in the direction of the magnetic field, with the resulting force on the charge pointing outwards from the palm. The direction of the magnetic field can also be clockwise or counterclockwise, depending on the direction of the current.
The magnetic pole model and the Amperian loop model are two simplified models for the nature of magnetic dipoles. The Amperian loop model predicts that the motion of electrons within an atom is connected to those electrons' orbital magnetic dipole moment, and these orbital moments do contribute to the magnetism seen at the macroscopic level.
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Frequently asked questions
Magnetism is defined as the physical phenomenon produced by moving electric charges. A magnetic field can induce charged particles to move, producing an electric current. An electric current in a wire generates a magnetic field around the wire.
An electromagnetic wave, such as light, has both an electric and magnetic component. These components travel in the same direction but are oriented at a right angle to one another. The speed of these electromagnetic waves is identical to the speed of light.
Michael Faraday discovered that light and magnetism are connected after observing that a substance like glass can rotate the plane of polarization of light in the presence of a magnetic field. This phenomenon is known as the Faraday effect.
Electromagnetism is the relationship between electricity and magnetism. It was first described by James Clerk Maxwell in his 1873 publication, "A Treatise on Electricity and Magnetism."
