World's smallest electric motor

School blocks YouTube? Use file below

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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

Review

Identify these magnetic poles

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?

3rd Left Hand Rule
Wire in a Magnetic Field

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?

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.

Why does the light filament wiggle?