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electromagnetic induction faraday
A LevelPhysics~4 min read
Overview
This lesson explores electromagnetic induction, the phenomenon where a changing magnetic field induces an electromotive force (e.m.f.) in a conductor. We will delve into Faraday's Law, which quantifies this induced e.m.f., and understand the factors influencing its magnitude.
Introduction to Electromagnetic Induction
Electromagnetic induction is a fundamental principle linking electricity and magnetism, discovered independently by Michael Faraday and Joseph Henry. It describes how a changing magnetic environment can generate an electric current or voltage. This phenomenon is the basis for many technologies, incl...
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Key Concepts
- Electromagnetic Induction: The production of an electromotive force (e.m.f.) across an electrical conductor in a changing magnetic field.
- Magnetic Flux (Φ): A measure of the total number of magnetic field lines passing through a given area, defined as Φ = BAcosθ.
- Magnetic Flux Linkage (NΦ): The product of the number of turns in a coil (N) and the magnetic flux (Φ) passing through each turn.
- Faraday's Law of Electromagnetic Induction: States that the magnitude of the induced e.m.f. is directly proportional to the rate of change of magnetic flux linkage.
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Exam Tips
- →Always remember the negative sign in Faraday's Law and explain its significance using Lenz's Law (opposition to change).
- →Be precise with definitions: distinguish between magnetic flux (Φ) and magnetic flux linkage (NΦ).
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