A student is investigating magnetic fields. The picture shows what happens when the student drops iron filings on a bar magnet. The student claims that the magnetic fields are not the same across the magnet. Using the picture, what evidence best supports the claim?

Question

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1 point
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The magnetic fields of the magnet are strongest at both poles.
The magnetic fields of the magnet are strongest at the north pole.
The magnetic fields of the magnet are strongest at the south pole.
The magnetic fields of the magnet are strongest at the middle.
As the distance between an object and a magnet increases, what happens to the force of the magnetism?
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it decreases
it increases
it stays the same
it becomes stronger
The image shows a large bar magnet with the poles labeled. How would the poles of the magnet change if it were divided into four equal parts?
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A

B

C

D
A student is investigating with magnets. She places one end of a bar magnet near the end of another bar magnet. The diagram shows her investigation. The student claims that the two magnets have a magnetic field that exists between them. What will occur that will support the student's claim?
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The magnets will repel each other as the closest poles have opposite charges.
The magnets will repel each other as the closest poles have like charges.
The magnets will be attracted to each other as the closest poles have like charges.
The magnets will be attracted to each other as the closest poles have opposite charges.
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Answer 1

Let's address each question one by one:

1. Evidence Supporting the Claim about Magnetic Fields:

   • Correct Answer: The magnetic fields of the magnet are strongest at both poles.
     • This statement provides clear evidence that the magnetic fields are not uniform, supporting the student's claim that magnetic strength varies across the magnet.

2. Effect of Distance on Magnetic Force:

   • Correct Answer: It decreases.
     • As the distance between an object and a magnet increases, the magnetic force acting on that object decreases.

3. Change of Poles when Dividing a Magnet:

   • Typically, if you divide a bar magnet into four equal parts, each piece will have its own north and south pole. The external magnetic field remains the same, but each segment will still have north and south poles due to the nature of magnetism.

4. Evidence Supporting the Claim of Magnetic Fields Existing Between Magnets:

   • Correct Answer: The magnets will be attracted to each other as the closest poles have opposite charges.
     • This supports the claim that a magnetic field exists between the two magnets because opposite poles attract each other.

By aligning your answers with the reasoning above, you can effectively support the student's investigation into magnetic fields.

Answer 2

Read the passage about Brian. "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?
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The two paper clips were not light enough to be pulled by the magnet.
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 were repelled by the electromagnet and not picked up.
Brielle tests the difference in the magnetic force of two electromagnets with different numbers of wire turns around the iron nails. She observes that the electromagnet with ten wire turns attracts more paper clips than the electromagnet with seven wire turns. What is her conclusion?
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1 point
Magnetic force increases with an increase in the number of wire turns around an iron nail.
Magnetic force decreases with an increase in the number of wire turns around an iron nail.
Magnetic force increases with a decrease in the number of wire turns around an iron nail.
Magnetic force is not affected by a change in the number of wire turns around an iron nail.
A student wishes to make the magnetic force exerted by the electromagnet shown below greater. Which procedure step could the student follow to accomplish this goal?
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1 point
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increase the length of wire at location 1
open the switch at location 2
add more batteries in series at location 3
reduce the number of wire turns at location 4
A student is conducting an experiment on the magnetic forces between a magnet and a paperclip. The magnet is placed on a scale in which the weight reads 2.00 ounces. A paperclip is suspended above the magnet so that the edge of the paperclip is just touching the magnet. Because the paperclip is exerting an upward force on the magnet, the scale now reads 1.63 ounces. Now the student begins a new experiment in which they place a stronger magnet on the scale. This magnet also weighs 2.00 ounces. Predict what will happen when the same paperclip is suspended above the magnet.
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The scale will read exactly 1.63 ounces because the paperclip that is used in this experiment is the same paperclip that was used in the first experiment.
The scale will read less than 1.63 ounces because the paperclip will exert an even greater upward force on the magnet.
The scale will read more than 1.63 ounces but less than 2.00 ounces because the stronger magnet will pull the paperclip down with even more force.
The scale will read exactly 2.00 ounces because the paperclip will not have an effect on the strong magnet.
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Answer 3

Let's analyze each question one by one and provide the most likely conclusions:

1. Conclusion Brian Can Draw About His Observation:

   • Correct Answer: The two paper clips did not have magnetic properties like the others.
     • This conclusion is the most logical because if all the paper clips are the same size and material, the only reason for two of them not being attracted could be that they lack magnetic properties.

2. Brielle's Conclusion About Magnetic Force:

   • Correct Answer: Magnetic force increases with an increase in the number of wire turns around an iron nail.
     • Brielle's observation supports the conclusion that more wire turns enhance the magnetic force of the electromagnet.

3. Procedure Step to Increase Magnetic Force:

   • Correct Answer: Add more batteries in series at location 3.
     • Adding more batteries increases the voltage across the wire, which will increase the current and thus increase the magnetic force of the electromagnet.

4. Prediction About the New Experiment with a Stronger Magnet:

   • Correct Answer: The scale will read more than 1.63 ounces but less than 2.00 ounces because the stronger magnet will pull the paperclip down with even more force.
     • With a stronger magnet, the paperclip will exert a greater upward force on the magnet, resulting in a greater reduction in the scale reading compared to the first experiment. Therefore, the scale will read between 1.63 ounces and 2.00 ounces.

By selecting these answers, you can accurately reflect the observations and predictions related to electromagnets and magnetic forces.

Answer 4

Simone has a mug of hot tea at a temperature of 90 °C. She sets the mug on a counter in a room with an air temperature of 30 °C. What is most likely to happen to the temperature of the hot tea?
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The hot tea will transfer thermal energy into the air, and the energy transfer will continue until the tea is at room temperature.
The air will transfer thermal energy into the tea, and the energy transfer will continue until the tea is at room temperature.
The air will transfer thermal energy into the tea and will continue to transfer energy until they are both 90 °C.
The hot tea will transfer thermal energy into the air and will continue to transfer energy until they are both 90 °C.

Answer 5

The correct answer to the question is:

The hot tea will transfer thermal energy into the air, and the energy transfer will continue until the tea is at room temperature.

Explanation:

In this scenario, the tea is initially at a higher temperature (90 °C) than the surrounding air (30 °C). According to the second law of thermodynamics, heat (thermal energy) will naturally flow from an object at a higher temperature to one at a lower temperature until thermal equilibrium is reached (i.e., they reach the same temperature). Thus, the hot tea will lose heat to the cooler air until its temperature decreases to match the room temperature.