Physical Science Ch. 20

The interaction between two magnets is called __________.

• current

• polarity

• magnetic force

• a magnetic field

Which is the correct sequence of steps in an electric power plant?

• energy source, generator, turbine

• turbine, energy source, generator

• generator, energy source, turbine

• energy source, turbine, generator

When does a magnet produce an electric current in a wire that is near it?

• only when the magnet moves

• only when the wire moves

• when either the magnet or the wire move

• when neither the magnet nor the wire move

Tags

NGSS.HS-PS2-5

Which action makes an electromagnet stronger?

• decreasing the current through the wire

• adding more coils of wire

• removing the ferromagnetic core

• making the coils of wire looser

Tags

NGSS.MS-PS2-3

Which creates a magnetic field?

• moving charged particles

• stationary charged particles

• moving neutral particles

• stationary neutral particles

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

Which of the following statements is NOT true?

• Earth's magnetic field is caused by molten metals in Earth's core.

• A compass alone will not direct you to the geographic north pole.

• Earth's magnetic field causes auroras that are sometimes seen at the poles.

• The magnetic poles of the Earth are at the same locaitons as the geographic poles.

Which is true of a temporary magnet?

• its atoms do not form magnetic domains

• its magnetic domains are always aligned in the same direction

• its magnetic domains become aligned only when it is placed near a magnet

• its material becomes ferromagnetic only when it is placed near a magnet

At which of the marked points in this image is the magnetic force strongest?

• point A

• point B

• point C

• point D

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Alternating current changes the __________ of the current flow.

• strength

• voltage

• amount

• direction

Which flows in only one direction through a wire?

• voltage

• direct current

• electric current

• alternating current