1/5/2023 0 Comments Electro magnet![]() ![]() An unmagnetized piece of iron is placed between two magnets, heated, and then cooled, or simply tapped when cold. Not only do ferromagnetic materials respond strongly to magnets (the way iron is attracted to magnets), they can also be magnetized themselves-that is, they can be induced to be magnetic or made into permanent magnets. Other materials exhibit weak magnetic effects, which are detectable only with sensitive instruments. A group of materials made from the alloys of the rare earth elements are also used as strong and permanent magnets a popular one is neodymium. Such materials are called ferromagnetic, after the Latin word for iron, ferrum. Only certain materials, such as iron, cobalt, nickel, and gadolinium, exhibit strong magnetic effects. Describe the relationship between electricity and magnetism.Explain the significance of the Curie temperature.Describe the role of magnetic domains in magnetization.Whatever is placed inside this coil will then be in a stronger magnetic field than if the wire was uncoiled.įor more information contact MagLab educator Carlos Villa. Coiling the wire concentrates the magnetic field inside the coil. So the wire carrying a DC current will have a small magnetic field around it. The DC current from a battery will create a flow of electrons in the same direction. Ask each group what they could do to make their magnets stronger for the next time they would do this.īy coiling a current carrying wire, you can concentrate the magnetic field in the center of the coil. The variables discussed should include battery strength, neatness of wire coiling, and number of coils. Let the students try a few ideas (number of batteries, more wire, neatness of the coil, temperature, etc…). ![]() There are several variable to strengthen the electromagnets. Compare and contrast the constructions of electromagnets of different strengths.
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