A student wishes to make the magnetic force exerted by the electromagnet shown below greater.
image e0200808b8fa436fae6f573f2546fa05
Which procedure step could the student follow to accomplish this goal?
Responses
add more batteries in series at location 3
add more batteries in series at location 3
reduce the number of wire turns at location 4
reduce the number of wire turns at location 4
increase the length of wire at location 1
increase the length of wire at location 1
open the switch at location 2
add more wire turns at location 4
that wasnt an awnser option tho?
My apologies, it seems that option was not provided in the answer choices. In that case, the student could add more iron core material inside the coils at location 4, which would increase the strength of the magnetic field and the force exerted by the electromagnet.
The picture shows an electromagnet and two paper clips that are the same size and are made of the same materials.
Which is the most likely reason that Paper clip Y does not move toward the magnet?
Responses
Paper clip Y is not light enough to be pulled by the electromagnet.
Paper clip Y is not light enough to be pulled by the electromagnet.
Paper clip Y is being repelled by the electromagnet.
Paper clip Y is being repelled by the electromagnet.
Paper clip Y is outside of the magnetic field produced by the nail.
Paper clip Y is outside of the magnetic field produced by the nail.
Paper clip Y is not magnetic like Paper clip Z.
Paper clip Y is not magnetic like Paper clip Z.
Brian made an electromagnet in his science class. He spread out several paper clips, all made of the same material and the same size, on a lab table. Holding his electromagnet in a fixed spot, he tried to attract as many paper clips as possible. He observed that there were two paper clips that were not attracted to his electromagnet.
What is the MOST LIKELY conclusion Brian can draw about his observation?
Responses
The two paper clips were not light enough to be pulled by the magnet.
The two paper clips were not light enough to be pulled by the magnet.
The two paper clips were repelled by the electromagnet and not picked up.
The two paper clips were repelled by the electromagnet and not picked up.
The two paper clips did not have magnetic properties like the others.
The two paper clips did not have magnetic properties like the others.
The two paper clips were outside the magnet's electromagnetic field.
The two paper clips did not have magnetic properties like the others.
The table below shows the farthest distance that magnets M, N, O, P can reach to pull a paper clip toward them.
Magnet Farthest Distance
Reached (cm)
M 4
N 8
O 3
P 6
Which magnet has the greatest magnetic force?
Responses
M
M
P
P
O
O
N
N
N
What must an object gain or lose to become electrically charged?
Responses
electrons
electrons
nucleus
nucleus
protons
protons
neutrons
electrons
A student is investigating the distribution of charge in a conductor. He attaches two unopened soda cans on their sides to two foam cups with tape. He sets the soda cans with the cups onto a tabletop so that they are touching one another. Then he moves a negatively charged balloon close to the left soda can. The set up for the investigation is shown.
How do the electrons move in the soda cans?
Responses
They move from the right can to the left can.
They move from the right can to the left can.
They move to the bottom in both cans.
They move to the bottom in both cans.
They move to the top of both cans.
They move to the top of both cans.
They move from the left can to the right can.
They move from the right can to the left can.
Robin has an iron rod around which she wraps copper wire. She places the device on a table near a compass. What will happen to the compass if she sends current through the copper wire?
Responses
The needle of the compass will point at a right angle to the device.
The needle of the compass will point at a right angle to the device.
The needle of the compass will show no effect.
The needle of the compass will show no effect.
The needle of the compass will spin in circles.
The needle of the compass will spin in circles.
The needle of the compass will point toward the device.
The needle of the compass will point toward the device.
If two charges are attracted to each other, then which of the following is true?
Responses
Both charges must be different.
Both charges must be different.
Both charges must be equal in value.
Both charges must be equal in value.
Both charges must be negative.
Both charges must be negative.
Both charges must be positive.
Both charges must be different.
A student claims that the gravitational force between two objects depends on the mass of the objects and the distance between them. Which argument best supports the student's claim?
Responses
If Earth were much bigger, the gravitational force between Earth and the Moon would be lower.
If Earth were much bigger, the gravitational force between Earth and the Moon would be lower.
If Earth were much bigger, the gravitational force between Earth and the Moon would be higher.
If Earth were much bigger, the gravitational force between Earth and the Moon would be higher.
If Earth were much bigger, the gravitational force between Earth and the Moon would disappear.
If Earth were much bigger, the gravitational force between Earth and the Moon would disappear.
If Earth were much bigger, the gravitational force between Earth and the Moon would not change.
If Earth were much bigger, the gravitational force between Earth and the Moon would not change.
If Earth were much bigger, the gravitational force between Earth and the Moon would be higher.
Danielle took an iron nail and wrapped thin copper wire around it, then connected the ends of the copper wire to a battery. Which force or forces can Danielle's device produce?
Responses
only a gravitational force
only a gravitational force
both electrical and magnetic forces
both electrical and magnetic forces
both magnetic and gravitational forces
both magnetic and gravitational forces
only an electrical force
both electrical and magnetic forces
A student rubs a rubber rod with fur, producing a negative charge on the rod. The student then touches the rod to a hollow, neutral metal sphere that stands on an insulating plastic stand. This transfers negative charges from the rod to the sphere:
image 63f9196b581c4f17bbe56cfd6ddd781f
Which statement best predicts what will happen to the charge, and why?
Responses
It will remain at the point of contact between the rod and the sphere, because resistance in the metal prevents the charges from easily moving.
It will remain at the point of contact between the rod and the sphere, because resistance in the metal prevents the charges from easily moving.
It will distribute itself evenly over the surface of the sphere, because like charges repel and the sphere is a conductor.
It will distribute itself evenly over the surface of the sphere, because like charges repel and the sphere is a conductor.
It will quickly spread to the air around the sphere, because it will seek to occupy as large a volume of neutral matter as possible.
It will quickly spread to the air around the sphere, because it will seek to occupy as large a volume of neutral matter as possible.
It will slowly drift to the bottom of the sphere because the charges rapidly attach to individual atoms, making them slightly heavier than surrounding atoms.