Electromagnetism

What must the electrons do in an object to give it a magnetic field?

• Flow in the same direction

• Flow in the opposite direction

• Collide into one another

• Equal the number of protons and neutrons

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What is an electromagnet?

• a magnet that creates an electric current

• a magnet created by an electric current

• a magnet that has an electric charge

• an electric charge that is magnetic

The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

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The lines on this image are called...

• magnetic field lines

• iron fillings

• graphite lines

• none of these

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You can make an electromagnet stronger by...

• increasing the current through the wire

• make the iron core bigger

• increase the number of loops around the core

• All of these

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How can a wire become magnetic?

• point it north

• add a resistor

• heat it up

• run a current through it

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Magnetic poles and electric charges are similar in that...

• like poles repel and opposites attract

• magnetic force is equal to electric force

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If the end of an unknown magnet sticks to a magnet pole labeled "North" the unknown end must be...

• North

• South

• East 

• West

Electricity can be used to create a magnet

• True

• False

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Which object would a magnet attract?

• a glass bottle

• a piece of paper

• a metal paper clip
  compass

• a rubber eraser
  magnetic field

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