Magnets come from an ore, magnetite, which can be found in different types of Earth's rocks. The rocks are called igneous, hydrothermal veins and metamorphic.
Magnetite, a black mineral, contains both ferric and ferrous ions, making it a good source of iron. Examples of igneous rocks that contain magnetite are amphiboles and biotite. Limestone is an example of metamorphic rock that contains magnetite. Hydrothermal veins like galena and pyrrhotite contain magnetite too. In the U.S, Wisconsin's Gogebic Range and Black River Falls are rich in magnetite.
Magnets can also be man-made. They are made of alloys or metals like iron. Though there has not been any concrete proof, yet magnets are advertised as pain management products.Learn More
Sedimentary rocks come from the fragments of pre-existing rocks called sediments. There are three types of sedimentary rocks, each coming from different kinds of sediments. Clastic sedimentary rocks are created from the broken pieces of other rocks, while chemical sedimentary rocks form from mineral crystals like halite and gypsum.Full Answer >
Fleming’s right-hand rule is a commonly used mnemonic in both physics and electrical engineering that shows the direction of the current generated in a conductor that is forcefully made to cut perpendicularly through a magnetic field. The force vector is perpendicular to the current and magnetic field vectors.Full Answer >
An AC generator, also called an alternator, is a device that converts mechanical energy into electrical energy. "AC" stands for "alternating current." The device generates alternating voltage by rotating a coil in the magnetic field.Full Answer >
Factors that can make a electromagnet stronger are increasing a coil's current flow, adding an iron core and increasing the number of turns to a coil. Building an electromagnet involves wrapping a copper wire around an iron core like a nail. A battery is then attached to this setup so that a current can flow through it.Full Answer >