Liang is working with an electrical circuit. She replaces a straight electrical wire with a coiled wire.

What is Liang most likely trying to do?

• increase the strength of the magnetic field when current flows through the circuit

• decrease the strength of the magnetic field when current flows through the circuit

• increase the current that flows through the wire when the circuit is active

• decrease the current that flows through the wire when the circuit is active

Tags

NGSS.HS-PS2-5

Horatio drew a diagram to illustrate how magnetism is produced by electric currents.

Which best explains Horatio’s error?

• Magnetism is not produced by electric currents unless the wire is coiled.

• The magnetic field does not continually spread outward from the wire.

• The magnetic field is produced inside the wire, not outside of it.

• Magnetism is only produced when a metal bar is placed near the wire.

Tags

NGSS.MS-PS2-3

What must be true in order for magnetism to induce an electric current in a wire?

• There needs to be a switch in the circuit.

• There cannot be a switch in the circuit.

• The wire must be part of a closed circuit.

• The wire must be part of an open circuit.

Tags

NGSS.HS-PS2-5

Parker wound a wire around a large iron nail. He then created an electromagnet by connecting the ends of the wire to different batteries. The table shows the current he measured for each electromagnet.

Which conclusion is best supported by the data?

• Electromagnet W is the strongest.

• Electromagnet X is weaker than electromagnet Z.

• Electromagnet Y is the strongest.

• Electromagnet Y is weaker than electromagnet X.

Tags

NGSS.HS-PS2-5

The north pole of a bar magnet is moved close to the north pole of a second bar magnet. What prediction best describes how the first magnet responds when it is released?

• It will move toward the second magnet because like poles repel.

• It will move toward the second magnet because like poles attract.

• It will move away from the second magnet because like poles repel.

• It will move away from the second magnet because like poles attract.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Two bar magnets are held close together. When they are released, they move toward one another. Which best describes the original placement of the magnets?

• The magnets are placed end to end with the north pole of each pointing toward the other.

• The magnets are placed end to end with the south pole of each pointing toward the other.

• The magnets are placed side by side with the like poles of each magnet near the other.

• The magnets are placed side by side with the opposite poles of each magnet near the other.

Tags

NGSS.MS-PS2-5

Based on illustrations of magnetic field lines, where could an object be placed so it would not experience a magnetic force?

• halfway between the like poles of two magnets, because the field lines bend away and do not enter this area

• halfway between the opposite poles of two magnets, because the field lines are the closest together

• above the middle of a bar magnet, because the magnetic field lines are only found around the sides of the magnet

• above a pole of a bar magnet, because the magnetic field lines either go in or go out at the end

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

Oran wants to model the behavior of Earth’s magnetic field when Earth’s magnetic south is near Earth’s geographic north using a ball, a bar magnet, and a compass. He designates the top of the ball as Earth’s geographic north.

Which model in the table would most likely represent Oran’s model?

• Model 1

• Model 2

• Model 3

• Model 4

Tags

NGSS.HS-PS3-5

Which provides resistance in an electric circuit?

• wire

• light bulb

• battery

• switch

Look at the circuit diagram.

How many switches does the diagram show?

• one

• two

• three

• four