Magnetism

What do magnetic field lines represent?

• The path of moving electrons
• The direction of magnetic force
• The strength of a magnet
• The shape of a compass needle

Which of these materials is attracted to a magnet?

• Wood
• Iron
• Plastic
• Glass

What happens when you cut a magnet in half?

• It loses its magnetism
• It becomes two smaller magnets
• It becomes a stronger magnet
• It turns into a non-magnetic piece

The Earth's magnetic field is similar to that of a:

• Bar magnet
• Light bulb
• Solar panel
• Battery

What is the purpose of the Earth's magnetic field?

• To attract metals
• To protect from solar radiation
• To generate electricity
• To guide compass needles

Which part of the Earth is responsible for its magnetic field?

• Crust
• Mantle
• Outer core
• Inner core

What is an electromagnet?

• A magnet made of iron only
• A magnet created by electricity
• A permanent magnet
• A magnet that repels metals

Which of these can increase the strength of an electromagnet?

• Using a thicker wire
• Using a longer wire
• Using a shorter wire
• Using a wire with no insulation

What happens when you increase the number of coils in an electromagnet?

• The magnetic field becomes weaker
• The magnetic field becomes stronger
• The electromagnet stops working
• The wire heats up more

What is the role of a battery in an electromagnet?

• To provide a magnetic field
• To supply electrical energy
• To cool the wire
• To insulate the wire