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WorksheetsElectricity and Magnetism Practice
Total questions: 24
Worksheet time: 12mins
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
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.
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.
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.
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.
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.
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
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
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
A component of a circuit changes, as shown below.
How would this change affect the electric circuit?
A switch is closed, so the circuit would be incomplete and broken and the lights in the circuit would not shine.
A switch is closed, so the circuit would be complete and unbroken and the lights in the circuit would shine.
A switch is opened, so the circuit would be incomplete and broken and the lights in the circuit would not shine.
A switch is opened, so the circuit would be complete and unbroken and the lights in the circuit would shine.
Linh builds a circuit from the diagram shown.
If Linh removes bulb 3, which bulbs will remain lit?
1 only
1 and 2 only
4 only
1, 2, and 4
A circuit has a current of 1.2 A. If the voltage decreases to one-third of its original amount while the resistance remains constant, what will be the resulting current?
0.3 A
0.4 A
1.2 A
3.6 A
A circuit has a current of 2 A. If the resistance in the circuit decreases to one-fourth of its original amount while the voltage remains constant, what will be the resulting current?
0.5 A
2 A
4 A
8 A
According to Ohm’s law, which combination of units is the same as the unit for voltage?
ohm ÷ ampere
ampere × ohm
ohm + ampere
ampere ÷ ohm
Masako measures a circuit at 12 V and 2 A. Using Ohm's law, what can he calculate for the circuit?
resistance Ω
resistance (O)
current (I)
current Ω
What does voltage describe?
how fast current can flow
how much current can flow
how much a material resists electrical flow
how fast a material conducts electrical flow
Which unit is used to measure resistance?
volts
charges
amperes
ohms
Dr. Eriksson is working on a material called selenium. She is adding a certain number and type of atoms to the selenium, which will control its conductivity.
Selenium is most likely what kind of material?
semiconductor
conductor
superconductor
insulator
Measurements of two electric currents are shown in the chart.
Which best compares the two currents?
Current X has a greater potential difference, and the charges flow at a slower rate.
Current Y has a greater potential difference, and the charges flow at a slower rate.
Current X has a greater potential difference, and the charges flow at a faster rate.
Current Y has a greater potential difference, and the charges flow at a faster rate.
Badri makes the table below to review the factors that affect the electric force between objects.
Which change will correct the error in Badri’s table?
changing “Direct” to “Indirect”
changing “Indirect” to “Direct”
changing “Distance” to “Amount of electric charge”
changing “Mass” to “Amount of electric charge”
The diagram shows two charged objects, A and B.
Based on the field lines, what are the charges of the objects?
A: positive
B: negative
A: negative
B: positive
A: negative
B: negative
A: positive
B: positive
How are the electric field lines around a positive charge affected when a second positive charge is near it?
The field lines combine with the lines around the second positive charge.
The field lines overlap with the lines from the second positive charge.
The field lines bend toward the second positive charge.
The field lines bend away from the second positive charge.
A positively charged object is placed to the left of a negatively charged object. Which best describes how the positively charged object will move?
to the left, in the direction of the electric field lines
to the right, in the direction of the electric field lines
up in the direction that the field lines bend away
down in the direction that the field lines bend away
