Magnetism & Electromagnets Review

While electric current is flowing through a wire, what surrounds the wire?

• a magnetic field
• a glowing light
• neutrons
• protons

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What two forces are required for generators and electric motors to work?

• magnetism and thermal

• electricity and thermal

• electricity and magnetism

• magnetism and radiant

Tags

NGSS.MS-PS2-3

How are electromagnets different from permanent magnets?

• magnets can be turned on/off

• you can turn an electromagnet on/off

• magnets are more powerful

• magnets have a North and South pole

In large generators in power plants, ___________ rotate inside a coil of wire to produce an electric current.

• Wind
• Water
• Magnets
• Circuits

Tags

NGSS.HS-PS2-5

What is the device seen here?

• generator
• electric motor
• electromagnet
• magnet

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What is the relationship between electrical current and magnetic field strength in an electromagnet?

• When current is increased, magnetic field strength increases
• When current is increased the strength of magnetic field decreases
• When the current is decreased, the strenght of the magnetic field is increased.
• There is an "indirect proportion," meaning, if the value of one goes up, the value of the other goes down.

Tags

NGSS.HS-PS2-5

Which of the following materials would be attracted to a magnet? (Select the 3 correct answers)

• Steel

• Magnesium

• Cobalt

• Nicket

• Zinc

A Student makes 4 electromagnets. Each one is made by winding some wire into a coil around a piece of metal as the core and then the student runs an electric current in each wire.

Which of them will be the strongest? (select one)

• 50 turns, low current, copper core

• 100 turns, high current, iron core

• 50 turns, low current, iron core

• 100 turns, low current, iron core

True or false. You can demagnetise a magnet by hitting it with a hammer several times.

• True

• False

What are the microscopic regions of atoms with a commonly aligned magnetic field called?

• micromagnets

• amps

• magnetic zones

• magnetic domains

Tags

NGSS.MS-PS2-3