Unit 7- Electromagnetism

Which is not a property of a magnet? 

• all magnets have two poles
• all magnets have a force of attraction or repulsion
• all magnets are surrounded by a magnetic field
• all magnets can be turned off

A device that uses a free-moving magnetic needle to show direction is a:

• lodestone

• magnet

• compass

• magnetic field

What causes electricity?

• moving neutrons
• moving protons
• moving atoms
• moving electrons

What type of charge do electrons have?

• negative
• positive 
• neutral
• nothing

What happens when you touch a metal doorknob after rubbing your shoes on the carpet?

•  The doorknob sends a burst of electric current into your body
•  Millions of electrons go from your finger into the doorknob
• The doorknob sends millions of electrons into your finger
• Your finger becomes negatively charged

Lightning is a form of static electricity. What can you infer about what happens when lightning strikes the ground?

• Protons and neutrons are transferred from the clouds to the ground

• The ground becomes negatively charged

• Electrons are transferred from the clouds to the ground

• An electric current is established between the clouds and the ground

What is the name of a magnet created by wrapping a current-carrying wire around an iron core?

• Electromagnet

• Magnetic Pole

• Voltage

• Electric Current

Where on a magnet is the force the strongest?

• Magnetic Pole
• Attract
• Repel
• Conductor

Which element is most closely associated with magnetism?

• iron

• aluminum

• calcium

• carbon

Magnets have opposite poles, sometimes called north and south.  When you put the north poles of two magnets together, the magnets will ________.

• Repel
• Explode
• Attract
• Spin