Electromagnetic induction

High school (ages 12+)
Science & Technology

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/electromagnetic-induction

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the fundamental law?Faraday's Law of Induction (EMF = -dΦB/dt)
2. What is the direction of current?Lenz's Law dictates that induced current opposes the change in magnetic flux
3. How did Faraday discover electromagnetic induction?Faraday moved magnets close to coils of wire and watched electric currents appear. He also changed the current in one coil and saw effects on a nearby coil, proving that moving magnets can make electricity.
4. Why does the induced current oppose the change in magnetic flux?Lenz's Law says the current always flows so it creates a magnetic field that pushes back against the change. This opposition keeps energy balanced and stops free energy from appearing.

Magnetic Flux: A measure of the total magnetic field lines passing through a given surface area.
Electromotive Force (EMF): The voltage generated by a changing magnetic field, capable of driving an electric current.
Lenz's Law: States that the induced current's magnetic field opposes the change in magnetic flux that created it, conserving energy.
Eddy Currents: Circulating electric currents induced within bulk conductors by a changing magnetic field.