1 2 3 Faradays Law Demonstration Falling Magnet

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Faraday’s Law

Demonstration: Falling Magnet 5

Magnet Falling Through a Ring

Demonstration: Jumping Rings

Jumping Ring

What is Going On? It looks as though the conducting loops have current in them (they behave like magnetic dipoles) even though they aren’t hooked up

Faraday’s Law Applets Discovery

Faraday’s Law Applets Discovery Activity

Demonstration: Induction

Electromagnetic Induction

Faraday’s Law of Induction

What is EMF?

Faraday’s Law of Induction

Magnetic Flux Thru Wire Loop Analogous to Electric Flux (Gauss’ Law) (1) Uniform B (2) Non-Uniform B

Minus Sign? Lenz’s Law

Faraday’s Law of Induction 19

Ways to Induce EMF

Group Discussion: Magnet Falling Through a Ring

Magnet Falling Through a Ring 22

Example: Magnitude of B Magnet Falling Through a Ring 23

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PRS Question: Faraday’s Law 25

PRS: Faraday’s Law: Loop : 00 26

PRS Answer: Faraday’s Law: Loop 27

PRS Question: Loop in Uniform Field 28

PRS: Loop in Uniform Field 29

PRS Answer: Loop in Uniform Field The motion does not change the magnetic flux, so Faraday’s Law says there is no induced EMF, or current, or force, or torque. Of course, if we were pulling at all up or down there would be a force to oppose that motion. 30

Group Problem: Changing Area Conducting rod pulled along two conducting rails in a uniform magnetic field B at constant velocity v

Changing Angle