A Current-Carrying Wire in a Magnetic Field

World's smallest electric motor

School blocks YouTube? Use file below

| Onsite |

Electric Motor

2 kinds of magnets - permanent and electric

Are the outside magnets N, N or S, S or N, S?

N, S - creates strongest field

Show Me The Physics
YouTube Channel

School blocks YouTube?
Use file below

ElectricMotor.MP4

The repulsive force between the electric
magnets and the permanent magnets
cause the motor to spin 

|Onsite|

[Link]

Review

Identify these magnetic poles

[ Flash ]

Describe the shape of this field

South Left, North Right

Field is straight in the middle and curved at the top and bottom

Fill In The Blank Notes

D) Direction of the force on a wire carrying current in a magnetic field

(Top View - Wire in a magnetic Field)

Force on wire? Into, Out of Page?

Out of Page

3rd Left Hand Rule
Wire in a Magnetic Field

Why Left and not right??

1) Draw Flux lines (N to S)

2) Left Thumb - direction of current

3) Four finger tips in direction of magnetic field

4) Palm shows direction of force on conductor

Figure 2 - Force on wire?

Out or In?

Out of Page

Figure 3 - Force on wire?

Out or In?

In

Force on conductor maximum when conductor placed perpendicular to field
 and zero when placed
parallel to the field.

[ Flash ]

Direct Current Electrical Motor
©Walter Fendt,
November 29, 1997

Forces Between Wires

Why does the light filament wiggle?

Show Me The Physics
YouTube Channel