Electricity and Magnetism Study Guide

Electricity & Magnetism

Test - Monday, September 23rd

Multiple Choice

Lilly builds a simple circuit to light up a light bulb. Her design is shown in the diagram. The light bulb in Lilly's circuit does not light up. Which BEST describes the reason?

• A switch is needed to allow energy to flow through the circuit.

• The circuit is missing a power source to provide energy to the battery.

• A second wire needs to connect the other side of the battery to the light bulb.

• The wire needs to run from the positive end of the battery instead of the negative end

Multiple Choice

Mika takes a load of clothes out of the dryer. She notices that a pair of socks are stuck together. When she separates the socks, she feels a small shock and hears a crackling sound.  Is this an example of static electricity or human-harnessed electricity?

• This is an example of static electricity which resulted from the steady flow of charge that is constantly moving through the socks.

• This is an example of static electricity which resulted from the build up of electric charges on the socks when they were tossed around in the dryer.

• This is an example of human-harnessed electricity which resulted from the steady flow of charge that is constantly moving through the socks.

• This is an example of human-harnessed electricity which resulted from the build up of electric charges on the socks when they were tossed around in the dryer.

Multiple Choice

The pictures show four balloons that have gained negative charges after being rubbed against hair. The four balloons are placed next to a wall.

Which balloon will most likely stick to the wall? Why

• W

• X

• Y

• Z

Multiple Choice

John wants to create a circuit to light up a bulb. He has a copper wire and a light bulb. What else does he need?

• a power source like a battery

• a wire that can conduct electricity

• a switch that will turn the power on and off

• an insulator that will stop the flow of electricity

Multiple Choice

Which describes the role of the paperclip in this diagram?

• It powers the circuit.

• It lights the bulb.

• It keeps the circuit open.

• It conducts electricity.

Multiple Choice

The diagram shows a simple circuit that Sam is building. Sam wants to put an insulator around the switch for safety. Which material would be a good choice?

• copper wire

• steel wool

• cork (wood)

• tin

Multiple Choice

Avery created an open circuit so that he could test which materials will act as insulators and which will act as conductors. Which of these materials will make the light bulb turn on if connected to Avery's circuit?

• plastic ruler

• rubber shoe

• wood pencil

• metal desk leg

Multiple Choice

A student plans an investigation with magnets. Her experimental procedure is shown.

What could the student do at step 3 to demonstrate how a magnetic field's strength can change?

• Step 3: use different amounts of water to moisten the paper Reason: When the paper becomes too wet, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use increasing thicknesses of paper Reason: When the paper becomes too thick, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use smaller squares of paper Reason: When the paper square becomes too small, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use different textures of paper Reason: When the paper becomes too smooth, the magnetic field will not pass through the paper, and the magnet will not stick.

Multiple Select

The diagram shows the mechanics for a doorbell. Electromagnets are used inside doorbells, but bar magnets are not. Select two reasons why bar magnets are not used in doorbells.

• The strength of a bar magnet's magnetic filed is always stronger than an electromagnets.

• Bar magnets do not conduct electricity.

• A bar magnet's magnetic field cannot be easily switched on and off.

• Bar magnets cannot produce as loud of a sound as electromagnets.

• The strength of a bar magnet's magnetic field cannot be easily adjusted.

Multiple Choice

James was studying types of electricity in Science class. Which BEST explains the difference between the electricity illustrated in the two pictures?

• Electricity type A is human-harnessed electricity that cannot be turned on and off, but electricity type B occurs naturally and can be turned on and off. 

• Electricity type B is human-harnessed electricity that can be turned on and off when needed, but electricity type A occurs naturally and cannot be turned on and off.

• Both electricty type A and electricity type B are examples of human-harnessed electricity because they are created by humans and easily controlled by humans.

• Both electricity type A and electricty type B are examples of naturally occuring electricity because they cannot be turned on and off. 

Multiple Choice

A student plans an investigation with magnets. Her experimental procedure is shown.

What could the student do at step 3 to demonstrate how a magnetic field's strength can change?

• Step 3: use different amounts of water to moisten the paper Reason: When the paper becomes too wet, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use increasing thicknesses of paper Reason: When the paper becomes too thick, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use smaller squares of paper Reason: When the paper square becomes too small, the magnetic field will not pass through the paper, and the magnet will not stick.

• Step 3: use different textures of paper Reason: When the paper becomes too smooth, the magnetic field will not pass through the paper, and the magnet will not stick.

Multiple Choice

You rub a balloon on your head and it becomes negatively charged. The balloon will be most attracted to

• a piece of metal

• positively charged hair

• the neutrally charged wall

• another negatively charged balloon

Multiple Choice

A student is designing an investigation using a magnetic wand. His initial set up is shown. Which investigation would be the best way for the student to use the magnetic wand to investigate how magnetic fields behave?

• He can use a longer rod to observe if the magnetic field strength of the wand will increase.

• He can use fewer paper clips to observe if the magnetic field strength of the wand will increase.

• He can use different colors of paper clips to observe which color will be attracted to the magnetic field of the wand the fastest.

• He can place different objects between the wand and the paper clips to observe how much of the magnetic field passes through them.

Multiple Select

A student is investigating with electromagnets and permanent magnets. She holds five magnets at an equal distance from fifty paperclips, and records her observations. The student performs the investigation twice. The graphs show her data. Which two arguments can be made using the student's data?

• Magnet 2 requires a source of electricity.

• Magnet 5 is the strongest of the magnets.

• Magnets 2 and 5 are permanent magnets that can attract iron objects.

• Magnets 1, 3, and 4 are permanent magnets that can be turned on and off.

• Magnets 2 and 5 are electromagnets because their magnetic strength can be adjusted.

Multiple Choice

Read the passage about doorbells and loudspeakers.

Doorbells and loudspeakers use electromagnets to cause motion. In a doorbell, the motion causes the bell to ring, and in a speaker, the motion causes the cone to vibrate and make sound. Select one reason why electromagnets are used inside of doorbells and speakers instead of bar magnets.

• Electromagnets are always on.

• Electromagnets can work without power.

• The strength of an electromagnet can be changed.

• The direction of an electromagnet's field is always the same.

Multiple Choice

How can a student increase the number of paperclips their electromagnet picks up?

• make the wire longer

• remove the nail from the center of the wire

• increase the number of loops of wire around the nail

• spread the loops of wire apart on the nail so they do not touch

Multiple Choice

What change would result in a stronger electromagnet

• reducing the number of batteries

• increasing the voltage of the battery

• substituting another metal for the iron core

• decreasing the number of coils around the iron core

Multiple Choice

Jorge is planning an experiment to demonstrate the different types of electricity. He creates lists of materials he will need for his experiments. From the information in Jorge's list of supplies, which claim could he make?

• Current electricity can flow through electrical insulators.

• Static electricity is easier to demonstrate.

• Static electricity does not require metal conductors.

• Current electricity cannot be used to attract other materials.

Multiple Choice

Amy conducted an experiment by placing objects around her house between two magnets.

Based on the results of the experiment, which of the following statements is best supported by the results of this experiment?

• The water caused the magnetic field to be deactivated.

• The glass did not create a magnetic field to allow the magnets to attract.

• The magnetic field was strong enough to attract through the notebook paper.

• The magnetic field of the magnets was deactivated because the magnets were attracted to the metal sign.

Multiple Choice

The table compares a bar magnet to an electromagnet.

Which statement correctly compares a bar magnet to an electromagnet?

• Bar magnets are stronger.

• Electromagnets are adjustable.

• Bar magnets are temporary magnets.

• Electromagnets are permanent magnets.

Multiple Choice

The plastic cover on a wire is not only to keep the electricity from going where it is not wanted but also to

• keep the wire from scratching furniture

• add color to a room's decor

• be a conductor that will protect you from getting shocked

• be an insulator that will protect you from getting shocked

Multiple Choice

Students are given the following supplies. They are asked to create a complete circuit using one or more of these items. Which of the following is a complete electric circuit?

Multiple Choice

Which material is a good conductor of electricity?

• a copper penny

• wooden dowel

• a rubber mat

• a plaster outlet cover

Did you get more than 3 wrong?

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