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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

Magnetism

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

properties of magnets
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
Magnetic Force
  • North attracts south
  • South repels south, and north repels north
strength of magnetic force
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
magnetic fields
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
what makes materials magnetic
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…

slide7
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.
can magnets loose their force
Can magnets loose their force?
  • Dropping or hitting a magnet will weaken the magnet, or even break it.
  • High temperatures will also demagnetize.
can you make a magnet
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.
the earth as a magnet
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?
three properties of magnets
Three Properties of Magnets
  • All magnets have two poles
  • They exert a magnetic force
  • They are surrounded by a magnetic field
what pole does a compass really point to
What pole does a compass really point to?

A magnet’s _____ pole

a) South b) North c) center

how temporary magnets are different from permanent magnets
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
what is a solenoid
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!
more on solenoids
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
question page 477
Question page 477
  • On Question 17, it shows four solenoids.
  • At your tables, discuss each one and rank them in order of strength.