8th Grade 9 weeks Test

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.

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

• attract, repel

• repel, repel

• attract, attract

• repel, attract

Which of the following is not a good conductor?

• Copper

• Silver

• Aluminum

• Plastic

What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

What is magnetic force?

• A force exerted by electrically charged particles

• The attractive and repulsive forces between two poles

• A force exerted by magnets that makes an object become electrically charged

• A force exerted by a magnet only when it physically touches an object

An object with a magnetic field is called a what?

• electromagnet

• magnet

• circuit

• magnetic material

What would happen with the magnets in the picture above?

• They would repel

• Nothing

• They would attract

• They would repel and then attract

Magnets have a north and south______.

• Pole

• Shape

• Color