Electric Charge

An object becomes positively charged when it __________.

• loses electrons

• loses protons

• gains electrons

• gains neutrons

Tags

NGSS.MS-PS2-3

As the distance between two charged objects increases, the strength of the electrical force between the objects __________.

• varies

• remains the same

• increases

• decreases

Tags

NGSS.MS-PS2-3

As the amount of charge on two objects increases, the strength of the electrical force between the objects __________.

• increases

• decreases

• varies

• remains the same

Tags

NGSS.MS-PS2-3

The diagram shows a coiled wire that carries an electrical current.

What do the arrows represent?

• the magnetic field

• thermal energy

• light energy

• the electric field

Tags

NGSS.MS-PS2-3

Georgia moves an unattached piece of wire back and forth over a magnet. Which best explains what will happen?

• A current will be induced because the wire moves through a magnetic field.

• A current will not be induced because the wire moves through a magnetic field.

• A current will be induced because the wire is not part of a closed circuit.

• A current will not be induced because the wire is not part of a closed circuit.

Tags

NGSS.HS-PS2-5

Frances drew a diagram to show electromagnetic induction.

Which label belongs in the area marked X?

• current

• magnetic field

• solenoid

• force on wire

Tags

NGSS.HS-PS2-5

What happens to an iron bar when it is placed within the coils of a solenoid?

• It induces a current.

• It stops the current.

• It becomes a magnet

• It loses its magnetism.

An object that is made of which material is likely to be attracted to a magnet?

• nitrogen

• nickel

• paper

• plastic

Tags

NGSS.MS-PS2-3

How are the magnetic field lines near the south pole of a magnet affected when a second south pole is brought near it?

• The field lines combine with the lines around the second south pole.

• The field lines overlap with the lines from the second south pole.

• The field lines bend toward the second south pole.

• The field lines bend away from the second south pole.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Which statement correctly describes Earth’s magnetic field?

• A compass can lead a hiker to the geographic North Pole.

• The magnetic pole near the South Pole is a north pole.

• Compasses point toward a magnetic pole that is a north pole.

• Field lines circle Earth from east to west.