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Download TCAP Worksheet #9 – Magnets
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Magnets TCAP Worksheet #9 Magnets • Any material that attracts iron or materials containing iron. • Magnets have a North and South pole. • Magnetism depends on the material’s atoms. Magnetic Domains • If most of the domains in an object are aligned, the magnetic fields of the individual domains combine to make the whole object magnetic. Demagnetized • When • domains move, the • magnet is demagnetized. • HOW?? Dropping a magnet or hitting it too hard. Putting the magnet in a strong magnetic field that is opposite to its own. • Increasing temperatures of a magnet. Types of Magnets • Ferromagnets – Magnets made with iron, nickel, cobalt, or mixtures of those metals. • Electromagnets – Magnets made by an electric current. • Temporary – Magnets made from materials that are easy to magnetize. • Permanent – Magnets made from materials that are difficult to magnetize but keep their magnetism. Earth as a Magnet • The North Pole and the Magnetic North Pole are two different locations. • Same with the South Poles. Electromagnetism • Electromagnetism • Electric current - The interaction produces a between electricity magnetic field. and magnetism • Therefore, you can use electricity to produce a magnet. Solenoid • Solenoid is a coil of wire that produces a magnetic field when carrying an electric current. • An electromagnet is a solenoid wrapped around an iron core. • This is a magnetic field. Solenoid • Strength of a solenoid can increase by two ways. • More loops in the wire. • Electric current is increased. Electromagnetism • Example – Doorbell • When the current is turned off, then the magnet is “turned off” Measuring • Galvanometer is used to measure electric current. Electricity from Magnetism • Electromagnetic induction is the process of creating a current in a circuit by changing a magnetic field. • You can move the magnet through the coil wire. (Changing the magnetic field). • Move it faster through the coil wire. • Remove the magnet from the coil wire. • Add more loops to wire. • Eek!