Magnetism grade 8

What is a magnet?

• An object that only repels magnetic materials

• An object that attracts magnetic materials and has two poles

• An object that only has one pole

• An object that attracts all types of metals

Which of the following is NOT a magnetic material?

• Iron

• Aluminum

• Nickel

• Cobalt

What is a magnetic field?

• A visible area where magnets work

• The space between two magnets

• The area around a magnet where its magnetic force can be detected

• The physical connection between two magnets

Magnetic field lines:

• Start from the South pole and end at the North pole

• Cross each other frequently

• Are farther apart where the magnetic field is stronger

• Start from the North pole and end at the South pole

What happens when you cut a magnet in half?

• One half becomes North, the other becomes South

• Both pieces lose their magnetism

• Each piece becomes a new magnet with both N and S poles

• The magnet loses its magnetic field completely

When two North poles of different magnets are brought together, they will:

• Attract strongly

• Create a neutral field

• Repel each other

• Form a permanent bond

The strength of magnetic attraction depends on:

• The temperature of the magnets

• The color of the magnets

• The shape of the magnets only

• The distance between the magnets

Where is a magnet's magnetic field strongest?

• In the middle of the magnet

• At its poles

• Equally throughout the magnet

• On the surface only

Which device uses Earth's magnetic field for navigation?

• Compass

• Thermometer

• Barometer

• Speedometer

Magnetic field lines never:

• Form closed loops

• Cross each other

• Start at the North pole

• End at the South pole