1. C H A P T E R   22
Electromagnetic Induction

2. 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

3. 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).

4. Inducing Current With a Coil in a Magnetic Field

5. An Automobile Cruise Control Device

6. 22.2 Motional Emf
The Emf Induced in a Moving Conductor

7. Equation for Motional Emf

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