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WorksheetsS8P5 GMAS Review - Electromagnetism Review
Total questions: 25
Worksheet time: 13mins
Which 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.
Which change would result in a stronger electromagnet?
using a smaller battery
using an iron nail with a larger diameter
changing the core to something made of aluminum
decreasing the number of wire coils around the nail
Attached is a picture of an electromagnet. Magnets and electromagnets can both be used to pick up metal items like iron nails. Although they are alike, there is a difference between magnets and electromagnets. An example of this is that increasing the current running through the electromagnet's wire will make it stronger. What is another difference?
Increasing the amount of wire loops will increase the strength of an electromagnet.
Increasing the amount of wire loops will increase the strength of a magnet.
There is no other difference between electromagnets and magnets.
Electromagnets are always stronger than regular magnets.
Donna is trying to make an electromagnet to pick up old nails around her driveway. Which of these materials would be best to use for the core in order to make the strongest electromagnet to pick up the most nails?
iron nail
wooden stake
plastic ruler
cardboard tube
Jake has four pairs of horseshoe magnets in different sizes. They are all made of the same material and have the same shape. He experiments by moving each pair farther and farther apart. Which pair of magnets will attract each other at the farthest distance?
the largest pair of magnets
the smallest pair of magnets
the third largest pair of magnets
the magnets all have the same amount of attraction
During induction, a positively charged rod is brought near to but not touching the electroscope. The presence of the positively charged object above the plate of the electroscope induces negative charges to move towards the electroscope, leaving the leaves with an overall positive charge. The positive leaves repel. The same process occurs when the north poles of two magnets are brought close together: the two poles push away from each other. Both illustrate the principle that
like charges or poles repel.
induction produces magnetism.
electricity induces magnetism.
opposite charges or poles repel.
Mike wants to negatively charge a small rubber ball. Which of these methods would successfully charge the ball?
heating the ball in boiling water
running the ball over a strong magnet
rubbing the ball back and forth on carpet
dropping the ball from a tall building
Static charges can be applied to neutral objects by friction, induction or conduction. What do all of these methods utilize to create this charge?
protons
electrons
heat energy
magnetic domains
A student is investigating how a negatively charged rubber rod affects charges distributed on two positively charged steel spheres that are in contact, as shown in the diagram below.
Which process will occur between the rubber rod and the sphere it is placed near?
Conduction, because they are not touching.
Induction, because they are not touching.
Friction, because one material is being rubbed on another.
Insulation, because the spheres are touching.
There are three ways to give an object a static charge. They are friction, conduction and induction. A student states she has two charged objects. She states that one was charged by the other by induction. What observation would support that statement?
The two objects repel each other.
The two objects have the same charge.
The two objects are oppositely charged.
The force between the objects decreases as they get closer to each other.
An electromagnet is created using a battery, an insulated copper wire and an iron nail. The wire is wrapped around the nail 20 times and attached to the battery. Which pair of changes will definitely increase the strength of the electromagnet?
Increase the voltage of the battery and decrease the number of turns of the coil.
Decrease the voltage of the battery and decrease the number of turns of the coil.
Increase the voltage of the battery and increase the number of turns of the coil.
Decrease the voltage of the battery and increase the number of turns of the coil.
Jacob floated a long steel sewing needle on a small piece of cork in a glass of water. He noticed that as he turned the glass around, the cork and needle continued to point toward his backyard. Even after he turned the small floating cork around gently, the needle finally pointed toward the backyard. What is the MOST LIKELY conclusion Jacob will draw?
There is a large magnet in the backyard.
Jacob’s backyard is on the north side of his house.
The backyard is downhill from where Jacob is standing.
A gentle breeze is causing the needle to point toward the backyard.
In 1665 Sir Isaac Newton proposed the fundamental law of gravitation as a universal force of attraction between any two bodies. What does this theory state about the force that makes an apple fall and the force that keeps the Moon in its orbit?
They are unpredictable.
They are the same force.
They cannot be compared.
They act in opposite directions.
How is the weight of an object in a spaceship near the moon related to the distance that the spaceship is from the moon?
There is no gravity on the moon and therefore they are not related.
As the distance to the moon decreases, the weight of the spaceship would increase.
As the distance to the moon increases, the weight of the spaceship would increase.
The gravitational pull of the moon is constant and therefore the weight would be a constant.
The diagram below shows two celestial bodies with the same mass, M, placed a distance, D, apart. What would increase the gravitational force between the two bodies?
Maintaining M and increasing D
Decreasing M and maintaining D
Decreasing M and increasing D
Increasing M and decreasing D
A 10.0 kilogram mass of iron on earth exerts a downward force of 98 Newtons. On the moon this same 10.0 kilograms of iron is weighed and found to exert a downward force of 16.3 Newtons. How is this possible?
The earth is farther away reducing the pull.
Weight is the same everywhere, but mass changes.
Mass begins to evaporate in the vacuum of space.
The gravity on the moon is one sixth the gravity of Earth.
Gravity on the Moon is about one-sixth the gravity felt on Earth. This is because
the Moon is so far away from Earth.
the Moon is much less massive than Earth.
Earth has a molten core and the Moon doesn't.
the Moon is so much further from the sun than Earth.
Four students are investigating electric motors. They have created an electric motor as shown in the diagram.
Which of the following changes should the students make if the students want to decrease the strength of the motor?
Increase the voltage of the power source being used to operate the motor.
Reduce the number of coils of copper wire.
Change the configuration of the magnets in relation to the copper wire.
Add a reducer cap to the end of the axle to inhibit movement.
A student is investigating magnetic fields with two magnets as shown below. Where will the magnetic fields be the strongest?
In the middle of the magnets.
Near the poles of the magnets.
Far away from the magnets.
The magnetic fields are the same everywhere.
Two oppositely charged objects are separated by a small distance. The objects are then moved three times farther apart from each other. Which of the following statements best describes what happens to the electrical force between the objects?
The force of attraction increases.
The force of attraction decreases.
The force of attraction becomes zero.
The force of attraction remains the same.
How do electrically charged objects affect neutral objects when they come in contact?
Electrons move from neutral objects to negatively charged objects through induction.
Protons move from positively charged objects to neutral objects through friction.
Protons move from neutral objects to positively charged objects through conduction.
Electrons move from negatively charged objects to neutral objects through conduction.
Which electromagnet would have the most strength?
An electromagnet with 5 coils.
An electromagnet with 10 coils.
An electromagnet with 15 coils.
An electromagnet with 20 coils.
Renaldo and Nasreen build an electromagnet by wrapping a wire around a nail and connecting the wire to both terminals of a battery. When they test the electromagnet, it can pick up 6 paper clips. Their teacher wants all groups to pick up at least 10 paper clips. What could Renaldo and Nasreen do to increase the number of paper clips 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
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.
Between which pair of objects would the LARGEST gravitational attraction be found? Assume there is an equal distance between the first and second items mentioned in all four answer choices?
an ant and the earth
a person and the earth
a person and a small bird
a small bird and the earth
