4.4 Mastery Check

What is a magnet?

• A material that conducts electricity

• A material that reflects light

• A material that gives off an external magnetic field

• A material that absorbs sound

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What happens to magnetic domains in magnetic elements?

• They are not always aligned

• They are forced to align

• They do not form a magnetic field

• They emit light

Tags

NGSS.MS-PS2-3

What is the result of non-aligned magnetic domains in nonmagnetic elements?

• Strong magnetism

• No apparent magnetism

• High conductivity

• Bright luminescence

What is the primary cause of magnetization in ferromagnetism?

• Alignment of atomic poles.

• Increase in temperature.

• Chemical reaction.

• Change in pressure.

Tags

NGSS.MS-PS2-3

Which of the following is a characteristic of ferromagnetic materials?

• They can become magnetized.

• They are always non-conductive.

• They are always liquid at room temperature.

• They are transparent.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

What happens when the switch is open in an electromagnet circuit?

• Current flows and the nail is magnetic

• No current flows and the nail is not magnetic

• The nail becomes permanently magnetic

• The battery is disconnected

What is the primary difference between an electromagnet and a permanent magnet?

• Electromagnets are always magnetic

• Permanent magnets require electricity

• Electromagnets require electricity to be magnetic

• Permanent magnets can be turned off

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

• Directly proportional

• Inversely proportional

• No relationship

• Exponentially proportional

Tags

NGSS.MS-PS2-3

How can the strength of an electromagnet be increased? Select all that apply.

• Increase the number of wire loops

• Increase the current

• Use a thinner wire

• Reduce the voltage

Tags

NGSS.HS-PS2-5

What happens to the magnetic field if the current in an electromagnet is turned off?

• It becomes stronger.

• It remains the same.

• It disappears.

• It reverses direction.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5