Magnetism

A _________________________ is the invisible force that surrounds a magnet.

• bar magnet

• a gravitational force

• a magnetic field

• gravity

Which is not a property of all magnets?

• Has a magnetic field

• exerts forces

• has 2 magnetic poles

• has 2 geographic poles

The center of a bar magnet is the strongest

• True
• False

The lines on this image are called...

• magnetic field lines
• iron fillings
• graphite lines
• none of these

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

• like poles repel and opposites attract
• magnetic force is equal to electric force

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

• North
• South
• East 
• West

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

Magnets stick to any materials that are made of

• Iron, Nickel, Copper
• Iron, Nickel, Cobalt
• Ions, Nickel, Cobalt
• Iron, Lead, Cobalt

The strongest parts of the magnet are ...

• fronts

• backs

• poles

• middle

True or False: All metals stick to magnets.

• True
• False