Home

 

 

 

 

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

 

 

 

 

St. Mary's 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

 

 

 

 

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?

 

 

 

UP

 

 

 

 

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?

Up or Down?


 

 

 

UP

 

 

 

Figure 3 - Force on wire?

Up or Down?

                 

 

 

 

Down

 

 

 

 

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

 

 

 

"Old School Physics " - How a DC Motor Works

Link

St. Mary's Physics YouTube Channel

 

 


Forces
Between Wires

 

 

 

Why does the light filament wiggle?

St. Mary's Physics YouTube Channel

 

 

 

©Tony Mangiacapre., - All Rights Reserved [Home]
Established 1995 - Use any material on this site (w/ attribution)