A student uses a magnet to place a picture on the refrigerator door. Which statement explains how the magnet is able to stick to the refrigerator without directly touching it?(1 point) Responses The picture’s own magnetic field attracts both the magnet and the refrigerator. The picture’s own magnetic field attracts both the magnet and the refrigerator. Friction acts through the picture and allows the magnet to stick to the refrigerator. Friction acts through the picture and allows the magnet to stick to the refrigerator. The force of gravity between the refrigerator and the magnet is strong enough to cause the magnet to stick. The force of gravity between the refrigerator and the magnet is strong enough to cause the magnet to stick. The magnet’s magnetic field can act at a distance, and influence the metal of the door through the picture.
The magnet’s magnetic field can act at a distance, and influence the metal of the door through the picture.
Natasha wants to create her own electromagnet that can pick up small pieces of metal like paper clips or iron fillings. Which list of materials would Natasha need to build her electromagnet?(1 point) Responses string, battery, iron nail string, battery, iron nail battery, iron nail, wire battery, iron nail, wire glass rod, wire, battery glass rod, wire, battery Rubberband, string, battery
battery, iron nail, wire
Below is a picture of an electromagnet made by wrapping a wire around an iron nail and connecting it to a battery. The electromagnet can be turned off by disconnecting it from the battery. A teacher helps students perform 2 experiments to test the variables that affect the electromagnet’s magnetic strength. Experiment 1 The students build an electromagnet using a 4.5 volt battery connected to an iron nail with coils wrapped around it. They change the number of coils around the nail and record how many paperclips the electromagnet can pick up each time. The results are shown in the table below. Experiment 2 In the second experiment, the students keep the same number of coils around the nail and records how many paperclips the electromagnet can pick up using different batteries. Which question can be answered based on the results of Experiment 2? (1 point) Responses How is the strength of an electromagnet affected by the number of coils around the nail? How is the strength of an electromagnet affected by the number of coils around the nail? How is the voltage of an electromagnet affected by the number of coils wrapped around the nail? How is the voltage of an electromagnet affected by the number of coils wrapped around the nail? How does the voltage of an electromagnet change when the type of paper clips changes? How does the voltage of an electromagnet change when the type of paper clips changes? How is the strength of an electromagnet affected by the voltage of the battery?
How is the strength of an electromagnet affected by the voltage of the battery?
A student wraps copper wire around an iron nail. Then she connects the ends of the wire to a battery, making an electromagnet. She notices that if she wraps more coils of wire around the bolt, then her electromagnet can pick up more paper clips. What conclusion can she draw?(1 point) Responses More coils of wire increases the mass of the battery More coils of wire increases the mass of the battery More coils of wire increases the strength of the electromagnet More coils of wire increases the strength of the electromagnet More coils of wire increases the density of the copper wire More coils of wire increases the density of the copper wire More coils of wire increases the length of the nail More coils of wire increases the length of the nail
More coils of wire increases the strength of the electromagnet.
A student conducts an experiment with a magnet and four objects. He puts the magnet near each of the objects, then observes and records the outcomes. Which question is the student’s experiment designed to answer?(1 point) Responses How does an object’s mass affect its reaction to a magnetic force? How does an object’s mass affect its reaction to a magnetic force? Can a magnetic force change the shape of an object? Can a magnetic force change the shape of an object? Which objects react to a magnetic force? Which objects react to a magnetic force? Which type of magnet can move an object?
Which objects react to a magnetic force?
A student made an electromagnet using an iron bolt, copper wire coiled three times around the bolt, and a battery. How can he increase the strength of his magnet?(1 point) Responses Add batteries to decrease the voltage, and increase the space between the coils of wire. Add batteries to decrease the voltage, and increase the space between the coils of wire. Add batteries to increase the voltage, and decrease the space between the coils of wire. Add batteries to increase the voltage, and decrease the space between the coils of wire. Add batteries to increase the voltage, and increase the space between the coils of wire. Add batteries to increase the voltage, and increase the space between the coils of wire. Add batteries to decrease the voltage, and decrease the space between the coils of wire.
