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MAGNETS Magnetic forces – Invisible forces that pull 2 magnets together A magnetic field surrounds all magnets (we call these magnetic field lines)

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Presentation on theme: "MAGNETS Magnetic forces – Invisible forces that pull 2 magnets together A magnetic field surrounds all magnets (we call these magnetic field lines)"— Presentation transcript:

1 MAGNETS Magnetic forces – Invisible forces that pull 2 magnets together A magnetic field surrounds all magnets (we call these magnetic field lines)

2 Magnetic poles (N + and S - ) The area where the magnetic force is greatest Don’t forget…like poles repel each other!!!

3 Earth’s magnetic poles Magnetic North is off from “geographic” North…why??? Some think it’s due to Earth’s internal heat

4 What minerals are magnetic? Iron Cobalt Nickel

5 Magnetic domains Groups of atoms with similar aligned poles Nail (temporary) vs. permanent magnet How can magnetism be reduced? Being dropped or heated Don’t forget…break a magnet, and you now have 2!

6 Electricity and magnets Moving charges produce a magnetic field (or force) The greater the current, the stronger the field (or force)

7 Electromagnets A magnetic element wrapped in wire This creates a magnetic field around the wire How do you create a stronger electromagnetic? Increase the loops Increase the amount of iron Increase the current What all uses these things? All electric motors Let’s talk about how a stereo speaker works…

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