Magnets

What characteristics do magnetic substances have?

• They can give you a "shock" when you touch them
• They can push or pull objects without touching them
• They are always black and cold to touch
• They fall faster than other objects when you drop them

What subject is attracted to a magnet?

• Silver
• Water
• Metal
• Iron

Ancient people discovered magnetic rocks called lodestone. What did they use them for?

• fires
• compasses
• sculptures
• weapons

What happens when two north poles of a magnet are placed together?

• they repel
• they attract
• they cancel each other out
• the strength of the magnet is doubled

What must happen for an electromagnet to have a magnetic field?

• It must be heated
• It must be touching another magnet
• It must be lined up with the Earth's magnetic field
• It must be connected to an electrical source

How is Earth's magnetic field similar to that of a magnet?

• It is hundreds of miles long
• It has north and south poles
• It is made in Earth's core
• It is shaped like a horseshoe

What is our best evidence that Earth has a magnetic field?

• All things fall toward Earth's center
• A compass needle lines up with it
• Winds blow from east to west
• Earth's oceans all have currents

Where is Earth's magnetic field strongest?

• Along the outside lines
• Along the inside lines on either side
• Where the lines are close together at the poles
• In the space outside of the lines

Earth's magnetic field and a bar magnet attract particles to the same locations. Where are they?

• The middle
• All around the outside
• The north and south poles
• First to the middle, then to the ends

Why does a compass needle point north?

• The compass is a bar magnet
• Because north is up
• Because it's magic
• It lines up with the Earth's magnetic field