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Questions and Answers
Who is generally credited with the discovery of electromagnetic or magnetic induction?
Who is generally credited with the discovery of electromagnetic or magnetic induction?
Michael Faraday
What is the mathematical description of electromagnetic or magnetic induction?
What is the mathematical description of electromagnetic or magnetic induction?
Faraday's law of induction
What law describes the direction of the induced field in electromagnetic induction?
What law describes the direction of the induced field in electromagnetic induction?
Lenz's law
In Faraday's first experimental demonstration, what did he wrap around opposite sides of an iron ring?
In Faraday's first experimental demonstration, what did he wrap around opposite sides of an iron ring?
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What did Faraday call the transient current he observed when he connected and disconnected the wire to a battery in his experimental demonstration?
What did Faraday call the transient current he observed when he connected and disconnected the wire to a battery in his experimental demonstration?
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What are the two aspects of electromagnetism?
What are the two aspects of electromagnetism?
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Which materials are strongly attracted by magnetic fields and can become permanent magnets?
Which materials are strongly attracted by magnetic fields and can become permanent magnets?
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What are the main types of magnetism exhibited by substances?
What are the main types of magnetism exhibited by substances?
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Name two examples of ferromagnetic substances.
Name two examples of ferromagnetic substances.
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Which materials have a weak attraction to an applied magnetic field?
Which materials have a weak attraction to an applied magnetic field?
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What are the main types of magnetism exhibited by substances?
What are the main types of magnetism exhibited by substances?
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Which materials are classified as ferromagnetic?
Which materials are classified as ferromagnetic?
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What are the two aspects of electromagnetism?
What are the two aspects of electromagnetism?
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Name two examples of paramagnetic substances.
Name two examples of paramagnetic substances.
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What is responsible for most of the effects of magnetism encountered in everyday life?
What is responsible for most of the effects of magnetism encountered in everyday life?
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Study Notes
Discovery of Electromagnetic Induction
- Michael Faraday is generally credited with the discovery of electromagnetic or magnetic induction.
Mathematical Description
- Electromagnetic induction is mathematically described by Faraday's Law, which states that the induced electromotive force (emf) in a closed loop is proportional to the rate of change of magnetic flux through the loop.
Law for Direction of Induced Field
- Lenz's Law describes the direction of the induced electric field, stating that it will oppose the change in magnetic flux that produced it.
Faraday's First Experimental Demonstration
- Faraday wrapped copper wire around opposite sides of an iron ring during his first experimental demonstration.
Transient Current Observation
- The transient current observed when connecting and disconnecting the wire to a battery was called "induced" current by Faraday.
Aspects of Electromagnetism
- The two aspects of electromagnetism are electric fields and magnetic fields.
Strongly Attracted Materials
- Materials that are strongly attracted by magnetic fields and can become permanent magnets are known as ferromagnetic materials.
Types of Magnetism
- The main types of magnetism exhibited by substances are ferromagnetism, paramagnetism, and diamagnetism.
Examples of Ferromagnetic Substances
- Common examples of ferromagnetic substances include iron and cobalt.
Weakly Attracted Materials
- Materials that have a weak attraction to an applied magnetic field are classified as paramagnetic.
Classification of Ferromagnetic Materials
- Ferromagnetic materials include elements like iron, nickel, and cobalt which have unpaired electrons contributing to their magnetic properties.
Examples of Paramagnetic Substances
- Examples of paramagnetic substances include aluminum and platinum.
Everyday Magnetism Effects
- Most effects of magnetism encountered in everyday life are primarily attributed to ferromagnetic materials.
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Description
Test your knowledge about electromagnetic or magnetic induction, Faraday's law, Lenz's law, and the Maxwell–Faraday equation. Learn about the production of electromotive force across an electrical conductor in a changing magnetic field and the historical contributions of Michael Faraday and James Clerk Maxwell.
