Electricity & Magnetism test review 2022

An electromagnet is useful for which 2 reasons

• A person can control if it is magnetic

• it is a strong permanent form of magnetism

• The magnetic field is always larger

• We can adjust the strength of the magnetic force

When an electric current is introduced what will happen to the domains of the nail

• The domains will continue to be arranged randomly

• The domains will go away

• The domains will align and create a magnet

• The domains will align and create electricity

Which of the following is not a good conductor?

• Copper

• Silver

• Aluminium

• Plastic

Particles with opposite charges ____________ and particles with same (or like) charges ____________.

• attract, repel

• repel, repel

• attract, attract

• repel, attract

What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.

• The strength of the magnetic field doesn't change.

• The strength of the magnetic field is doubled.

• The strength of the magnetic field decreases.

What is responsible for creating a magnetic field around Earth?

• Earth's crust

• Earth's iron core

• Earth's mantle

• Earth's atmosphere

What is the difference between a conductor and insulator?

• conductor: allows electricity to flow easily.

  insulator:does not allow electricity to flow easily

• conductor: does not allow electricity to flow easily

  insulator: allows electricity to flow easily

What happens if you cut a magnet in half?

• Nothing

• The magnets repel

• There will be two magnets

The picture above is an example of what?

• Magnetic field

• Electric field

• Repulsion

• Attraction

What would happen with the magnets in the picture above?

• They would repel

• Nothing

• They would attract

• They would repel and then attract