Forces at a Distance

According to Lesson 2 (Investigation 2), how do the magnet and copper coil behave when there is an electric current in the coil?

• They still do not interact at all

• They can pull on each other only

• They can push on each other only

• They can push or pull on each other

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According to Lesson 2, how can we get the copper coil and magnet to change the direction of the force they apply to each other when the electricity is moving through the coil?

• We can't control which direction they apply force on each other

• We can turn the direction of the magnet or the coil

• We can disconnect the wires

• We can only make them apply force in one direction

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According to lesson 2, an object that is able to attract other objects containing iron from a distance anytime is called a:

• Electromagnet

• Permanent magnet

• A power source

• A conductor

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An object that can be a magnet when electricity is passing through it is called a(n):

• Permanent magnet

• Conductor

• Partial magnet

• Electromagnet

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According to Lesson 3, we concluded that magnetic forces:

• Need matter in order to travel

• Do not need matter in order to travel

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According to Lesson 4, we know that forces in magnetic fields around electromagnets:

• Move north to south

• Move south to north

• Move north only

• Move south only

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In magnets and electromagnets, dissimilar (opposite) poles attract

• true

• false

When the strength of the magnetic field changes, the ________________________between the coil and the permanent magnet changes.

• attractive force

• polarity

• wire

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True or False: Electromagnets can be turned off.

• True

• False

How is a permanent magnet different from a temporary magnet?

• A permanent magnet attracts materials made of iron.

• A permanent magnet has poles.

• A permanent magnet has a magnetic field.

• A permanent magnet keeps its magnetism for a long time.