Review-PS2-5 Electric Currents and Magnetic Fields

Students wish to determine the relationship between the current in the circuit

And the magnetic field strength. For each trial, students keep the switch closed

And vary the voltage of the battery while measuring the current and the magnetic 

field strength. The results are presented in the table.

What conclusion can the students draw regarding the relationship between the magnetic field strength and current in the circuit?

• 1. Based on the experimental data, the magnetic field strength is directly related to the current in the circuit.

• 1. Based on the experimental data, the magnetic field strength is inversely related to the current in the circuit.

• Based on the experimental data, there is no relationship between the magnetic field strength and the current in the circuit.

• 1. A conclusion cannot be drawn because the current and magnetic field strength are both dependent variables in this experiment.

Tags

NGSS.MS-PS2-3

 A magnetic compass is placed near an insulated copper wire. When the wire is connected to a battery, the compass needle changes position.

Which of the following is the best explanation for the movement of the needle?

• 1. The copper wire magnetizes the needle to create a force.

• The needle magnetizes the copper wire to create a force.

• 1. The current in the wire produces a magnetic field and exerts a force on the needle.

• 1. The insulation on the wire becomes energized and exerts a force on the needle.

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5

 Precise measuring instruments require shock absorbers to eliminate small vibrations that can affect the results of an experiment. One type of shock absorber that can be used is an electromagnet that repels a magnetic platform placed above it.

Which of the following setups would provide the greatest lift to the platform?

• 
• 
• 
• 

Tags

NGSS.MS-ETS1-1

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-3

A student builds a simple circuit and places a magnet under one of the 

circuit’s wires. When the switch is closed, charges flow in the circuit and 

the wire moves, as shown in the diagram.

Which question is the student most likely trying to answer?

• 1. Does a positive charge build up in the wire?

• 1. Does a negative charge build up in the wire?

• 1. Does the current in the wire create a magnetic field?

• 1. Does the current in the wire cause the wire to heat up?

Tags

NGSS.MS-PS2-3

 A student began an investigation by wrapping several coils of insulated wire around a steel nail. As shown in the diagram, when the ends of the wire were connected to a battery, the student was able to pick up several steel paper clips with the end of the steel nail.

Which of the following claims is best supported by the student’s investigation?

• 1. An electric current in the wire produces a magnetic field.

• 1. An electric current in the wire produces a potential difference.

• 1. A magnetic field can produce an electric current in the wire.

• 1. A magnetic field can produce an electric current in steel paper clips.

Tags

NGSS.MS-PS2-3

Why might an electromagnet be used to pick up old cars in 

junkyards?

• 1. Electromagnets are inexpensive and easily create revenue.

• 1. Electromagnets are powerful and can be turned on and off easily.

• 1. Electromagnets are easy to operate and can be run by cheap labor.

• 1. Electromagnets are versatile and can pick up any metallic objects in the yard.

A student coiled wire around a nail, attached both ends to a 1.5-V battery, and attempted to lift paper clips with the nail.

What is a valid conclusion for this investigation?

• 1. Increasing voltage increases electromagnetic strength.

• 1. Increasing the number of turns of wire decreases electromagnetic strength.

• 1. Increasing the number of turns of wire increases electromagnetic strength.

• 1. Increasing the number of turns of wire has no effect on electromagnetic strength.

Tags

NGSS.MS-ETS1-3

 A student performed an experiment to determine the number of paper clips that are 

attracted to an electromagnet as the amount of current changes.

Which graph best describes the relationship between magnetism and electrical current?

• 
• 
• 
• 

Tags

NGSS.MS-PS2-3

A temporary magnet in which the magnetic field is produced by electric current is called

• electromagnet

• electric field

• magnetic force

• electric force

The arrows on the picture represents

• magnetic field

• electric field

Tags

NGSS.MS-PS2-3

NGSS.MS-PS2-5