8th Science 2-1 and 2-2

As a student walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges?

• The charges just dissapeared

• The charges switched signs

• The charges transferred to another object

• The charges broke apart into smaller particles

Two objects have a positive electric charge. Which statement describes the force that is exerted on the objects due to their electric charge?

• There is a force pushing both objects to the left

• There is a force pulling the objects toward each other

• There is a force pushing the objects away from each other

• There is no force on the objects due to their electric charges

Which mixture of substances could be separated into its separate parts by using a magnet?

• salt and pepper

• pepper and iron dust

• salt and sugar

• salt and sand

Which of the following is not naturally magnetic?

• iron

• nickle

• cobalt

• gold

A substance that is naturally magnetic is called

• ferromagnetic

• hypermagnetic

• transmagnetic

• comagnetic

Match the following

• magnet

• a continuous flow of electric charges from one region to another

• electric charge

• an object that attracts or pulls on materials that contain iron

• electric current

• a push or a pull exerted by magnets

• magnetic force

• physical property of all matter that leads to electric and magnetic interactions

• electric force

• the force of attractions or repulsion between objects due to their charges

In some materials, such as iron, the north poles of groups of atoms line up in the same direction in areas called

• Magnetic zones

• Magnetic domains

• Magnetic envelopes

• Magnetic auras

The interaction between electricity and magnetism is called

• magnetic electricity
• electromagnetism
• magnetoelectricity
• electromagnetic force

A coil of wire with a current running through it is called a

• transformer
• magnet
• conductor
• solenoid

A coil of wire around an iron core that makes use of the magnetic field generated by an electric current in a wire is called a

• magnet
• conductor
• transformer
• electromagnet