What is Faraday’s Law of Induction. What was revolutionary about the law?

College Physics
1st Edition
ISBN:9781938168000
Author:Paul Peter Urone, Roger Hinrichs
Publisher:Paul Peter Urone, Roger Hinrichs
Chapter23: Electromagnetic Induction, Ac Circuits, And Electrical Technologies
Section: Chapter Questions
Problem 15PE: Use Faraday’s law, Lenz’s law, and RHR—l to show that the magnetic force on the current in the...
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What is Faraday’s Law of Induction. What was revolutionary about the law?

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When a magnetic flux changes through a coil  then an emf is induced in the coil, this is known as electromagnetic induction.

Faraday's law of induction can be summarized in two points given below:

1. The induced emf is given y following formula:

E=-Ndt

here, E is the induced emf, N is the number of turns, φ is the magnetic flux.

Negative sign comes in accordance with Lenz's law.

2. The emf will be induced as long as the magnetic flux changes. If the change in flux stops then emf will be zero.

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