The correct statement explaining how the magnet is able to stick to the refrigerator without directly touching it is:
- The magnet's magnetic field can act at a distance and influence the metal of the door through the picture.
To understand this, it is important to know that magnets have a property called a magnetic field. This magnetic field is the region around a magnet where its force can be felt. When a magnet is brought close to a metal surface, such as the refrigerator door in this case, its magnetic field can interact with the metal. This interaction creates a force that pulls the magnet towards the metal, allowing it to stick without directly touching.
As for the second question, Natasha wants to create her own electromagnet that can pick up small pieces of metal like paper clips or iron fillings. The correct list of materials she would need to build her electromagnet is:
- battery, iron nail, wire
To build an electromagnet, Natasha would need a power source, which is the battery in this case. The iron nail acts as the core of the electromagnet, providing a path for the magnetic field to flow through. The wire is wrapped around the iron nail to create the coils that will carry the electric current from the battery. When the battery is connected to the wire, it creates a magnetic field around the coils, turning the iron nail into a magnet that can attract and pick up small pieces of metal.
Moving on to the third question, based on the information given about Experiment 2, the question that can be answered is:
- How is the strength of an electromagnet affected by the voltage of the battery?
In Experiment 2, the students kept the same number of coils around the nail and recorded how many paperclips the electromagnet could pick up using different batteries. By comparing the results, they can determine whether increasing or decreasing the voltage of the battery has any effect on the strength of the electromagnet. The strength of the electromagnet refers to its ability to attract and pick up the paperclips, and the voltage of the battery is one of the variables being tested to see how it affects the strength.