magnetics

What happens when two bar magnets repel each other?

• The poles of the magnets pull toward each other.
• The poles of the magnets push away from each other.
• The centers of the magnets pull toward each other.
• The centers o the magnets push away from each other.

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

A compass _______ is the part of a compass that is magnetic.

• bar
• dial
• needle
• rose

Why are magnetic poles called north and south?

• because the needle points up and down
• because it lines up with Earth's axis
• because magnets help with direrctions
• because it sounds cool

What causes electricity?

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

What type of charge do electrons have?

• negative
• positive 
• neutral
• nothing

What type of electricity occurs when you rub a balloon on your sweater?

• thermal electricity
• current electricity
• static electricity
• work electricity

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