Magnetism and motors

Magnetism is generated by moving

• protons.
• electrons.
• neutrons.
• elements.

What do the lines around this magnet represent?

• North Pole
• South Pole
• Magnetic Declination
• Magnetic Field

As the distance between two magnets increases (they get farther apart), the force between them:

• Increases
• Decreases
• Stays the Same

What is responsible for the Magnetic Field around Earth?

• The Earth's crust
• The Earth's molton iron core
• The Earth's mantel
• The Sun

An electromagnet's poles may be reversed by:

• decreasing the voltage of the coil
• increasing the number of coils
• changing the direction of current flow
• altering the material used to make the coils

In un-magnetized materials the domains are __________ aligned.

• super
• slightly
• randomly
• always

What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

The strongest part of a magnet is...

• the bars.
• the force field.
• the poles. 
• the middle.

What causes magnetism?

• the sun

• moving neutrons

• moving charges

• friction

How can a wire become magnetic?

• point it north

• add a resistor

• heat it up

• run a current through it