Question

Watch the video below to help you answer the following questions.
Electromagnet

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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1 point
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
Captionless Image
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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1 point
Captionless Image
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 1

1) The two paper clips were outside the magnet's electromagnetic field.

2) Magnetic force increases with an increase in the number of wire turns around an iron nail.

3) Add more batteries in series at location 3.

4) The scale will read less than 1.63 ounces because the paperclip will exert an even greater upward force on the magnet.