Magnetism and Induction

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

• Increases
• Decreases
• Stays the Same

If you cut a magnet in half, what happens to the poles?

• One half gets the North Pole, the other half gets the South Pole
• Both halves get only a North Pole
• Both halves get only a South Pole
• Both halves get a North pole and a South Pole

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

Which direction is the North Pole of this electromagnet?

• Right
• Left
• Up
• Down

In un-magnetized materials the domains are __________ aligned.

• super
• slightly
• randomly
• always

The strongest part of a magnet is...

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

How can a wire become magnetic?

• point it north

• add a resistor

• heat it up

• run a current through it

What device takes in mechanical energy and produces electricity?

• motor

• generator

• electromagnet

• battery

Electric motors are devices that convert _____ energy into  _____ energy.

• electrical; mechanical
• mechanical; electrical
• chemical; potential
• mechanical; kinetic

If you place the North pole of a magnet next to the South pole of another magnet, they will:

• Attract
• Repel
• Do nothing
• Shatter