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### Magnetic Induction

Transforming energy with magnetism

F = qv B

Lorentz Force ReminderSource: Griffith, The Physics of Everyday Phenomena

Fis directed out of the screen.

CPS Question

What is the direction of the Lorentz force on the charges moving in this wire?

B

A.

D.

B.

E.

C.

F.

I

Motional emf

- Moving a conductor through a magnetic field causes separation of charges.
- Back-emf (motional emf) in conductor cancels potential from motion
e = lvB

- when l, v, B all orthogonal

b

c

d

e

Group Work- At which position(s) does the most magnetic flux pass through the loop?
- At which position(s) does the magnetic flux through the loop change the fastest?

b

c

d

e

Faraday’s Law- Greatest fluxF when perpendicular
- Fastest change in flux DF/Dt when parallel

V

through the field

v

V

induces a potential

v

B

Rotation Powers a Generatorwhich generates a current

that charges the battery

Group Work

Which direction is the flux change?

What current would oppose it?

What is the Lorentz force on each side?

If the magnetic field intensifies, in what direction will the induced current be?

B

How a Loudspeaker Works

loudspeaker

induced motion of magnet

current-generated field attracts or repels magnet

current

m

I

Back Potential- As the motor turns, back-potentialDFB/Dt opposesm
- Faster rotation more back potential

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