C H A P T E R 22 Electromagnetic Induction.

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Presentation transcript:

C H A P T E R 22 Electromagnetic Induction

Chapter 22 Electromagnetic Induction Induced emf and Induced current Motional emf Magnetic flux Faraday’s law of electromagnetic induction Lenz’s law Applications: cruise control, ground fault interrupter, induction stove, electric guitar, microphone, & speaker. Electric generator Inductance Transformers and electric power transmission

22.1 Induced Emf and Induced Current (a) When there is no relative motion between the coil of wire and the bar magnet, there is no current in the coil. (b) A current is created in the coil when the magnet moves toward the coil. (c) A current also exists when the magnet moves away from the coil, but the direction of the current is opposite to that in ( b).

Inducing Current With a Coil in a Magnetic Field

An Automobile Cruise Control Device

22.2 Motional Emf The Emf Induced in a Moving Conductor

Equation for Motional Emf

Right Hand Rule Right hand rule can be used to find the direction of the induced current.