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Magnetism

Magnetism. Students will describe the properties of magnets and demonstrate their fields. Properties of Magnets. Magnets have two poles – north and south The magnetic force is strongest at the ends of a magnet which are called poles They exert a magnetic force. Magnetic Force.

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Magnetism

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  1. Magnetism Students will describe the properties of magnets and demonstrate their fields.

  2. Properties of Magnets • Magnets have two poles – north and south • The magnetic force is strongest at the ends of a magnet which are called poles • They exert a magnetic force

  3. Magnetic Force • North attracts south • South repels south, and north repels north

  4. Strength of Magnetic Force • The closer two magnets, the stronger the force. • The further two magnets are, the weaker the force becomes. • This is very similar to the gravitational force between two masses

  5. Magnetic Fields • A magnetic field exists in the region around a magnet • The shape of the field reflects the shape of the magnet, as you will learn in the lab today • You will draw the field around each magnet that you test

  6. What makes materials magnetic? • Some materials are magnetic, some are not • The atoms of some materials cancel out the magnetic charge resulting in an inability to magnetize. continued…

  7. With atoms in other materials, the electrons clump on one side creating a polar molecule. One end is negatively charged and one is more positively charged. • The atoms line up, negative side attracting the next atom’s positve side • This creates a positive end and negative end in the material.

  8. Can magnets loose their force? • Dropping or hitting a magnet will weaken the magnet, or even break it. • High temperatures will also demagnetize.

  9. Can you make a magnet? • You can temporarily magnetize certain materials • The atoms in those materials will align north and south for a short time • In the lab today, make a magnetic chain of paper clips (without twisting them together) and see how long you can make it. Ends linking ends.

  10. The Earth as a Magnet • What do you recall about the earth as a magnet? • Where are the ends of the “earth” pretend magnet? • What are they called?

  11. Three Properties of Magnets • All magnets have two poles • They exert a magnetic force • They are surrounded by a magnetic field

  12. What pole does a compass really point to? A magnet’s _____ pole a) South b) North c) center

  13. How Temporary Magnets are different from Permanent Magnets • Temporary magnets are easy to magnetize, but lose their magnetization easily • Permanent magnets are difficult to magnetize, but retain their magnetic properties for a long time

  14. What is a Solenoid • A solenoid is a coil of wire that produces a magnetic field when carrying an electric current • Attach a wire to a battery that has coils, and it will create a magnetic field! See page 463 in your books!

  15. More on Solenoids • An iron core creates a stronger magnetic field • The more coils, the stronger the magnetic field • The more amperage, the stronger the magnetic field

  16. Question page 477 • On Question 17, it shows four solenoids. • At your tables, discuss each one and rank them in order of strength.

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