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Magnetic Substances  A magnet is an object that can attract other objects containing iron, cobalt, or nickel.  Magnetism describes all the phenomena.

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Presentation on theme: "Magnetic Substances  A magnet is an object that can attract other objects containing iron, cobalt, or nickel.  Magnetism describes all the phenomena."— Presentation transcript:

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2 Magnetic Substances  A magnet is an object that can attract other objects containing iron, cobalt, or nickel.  Magnetism describes all the phenomena caused by magnets  Has two opposite poles - North and South  Similar poles repel & opposite poles attract  The magnetic field can be mapped

3 Ferromagnetic Substances  Not a magnet but something that can become magnetized by hitting, heating, or touching it with a magnet OR by adding an electrical charge (electromagnet)  Is attracted by a magnet  Must contain one of the following: iron, nickel or cobalt  The magnetism can be turned on and off.

4 Non-magnetic Substance  Cannot be magnetized  Glass, plastic, rubber or wood  Work well as insulators for electrical wires

5 Mapping Magnetic Fields  Rules: The magnetic field lines can never cross Always flow from North to South The closer the lines, the stronger the attraction

6 Magnets  Shape – shown by lines of force which can be straight, curved, or circular  Direction – shown by arrowheads. The direction is ALWAYS from North to South  Strength – shown by how close the lines are to each other. Closer the lines, the stronger the magnetic field

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9 Compass The needle of the compass is magnetic Red (or any color) tip of the needle is considered North and will always be attracted towards its opposite the South

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11 Magnetism  Magnetism describes all the phenemona caused by magnets  Magnetic Field is the area of space in which the magnetic force of a magnet can act on another magnet  Electromagnetism describes all the phenomena resulting from the interaction between electricity and magnetism

12 Magnetic Live Wire Field  Right hand rule can determine which direction the magnetic field lines are moving (fingers)  What direction the conventional current is moving (thumb)


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