According to Faraday's Law of Induction, what condition is necessary for a magnetic field to induce an electric current in a loop of wire?

The magnetic field must be changing with time.

Define magnetic flux and explain its significance in electromagnetic induction.

Magnetic flux is a measure of the magnetic field running through a loop of wire. A change in magnetic flux induces an EMF, leading to an electric current.

List three factors that affect the magnetic flux through a loop of wire.

The strength of the magnetic field, the area of the loop, and the angle between the magnetic field and a line perpendicular to the loop.

Explain how increasing the number of loops in a coil of wire affects the induced EMF.

Increasing the number of loops in a coil increases the induced EMF proportionally. If you double the loops, you double the EMF.

State Lenz's Law and explain its importance in determining the direction of induced current.

Lenz's Law states that the magnetic field generated by the induced current will be in the direction opposite to the change in magnetic flux. It helps determine the direction of the induced current.

Creating Current with Magnetism

9th GradePhysics60 min

aligned to Hs-ps2-1 Hs-ps2-3 Hs-ps2-5 Hs-ps3-1

Learning Objective

I can describe how a changing magnetic field can produce an electric current.

Lesson Flow

Watch Video

10 min

Induction - An Introduction: Crash Course Physics #34

CrashCourse

Guided Notes

12 min

Key concepts students will learn:

•
According to Faraday's Law of Induction, a changing magnetic field will induce an electromotive force (EMF) in a loop of wire.
•
Magnetic flux is a measure of the magnetic field running through a loop of wire, and the induced EMF is equal to the negative of the change in flux over the change in time.
•
Lenz's Law states that the magnetic field generated by the induced current will be in the opposite direction of the change in magnetic flux.

Practice

18 min

12 questions • Multiple choice & Short answer

Exit Ticket

5 min

“Describe one way a changing magnetic field can be used to create an electric current.”

Teacher Guide

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Answer keys for all questions
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Creating Current with Magnetism

Learning Objective

Lesson Flow

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Guided Notes

Practice

Exit Ticket

Teacher Guide

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