Magnetism - More free powerpoints at...

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Unformatted text preview: More free powerpoints at http://www.worldofteaching.com Magnets have been known for centuries. Magnets have been known for centuries. The Chinese and Greeks knew about the The Chinese and Greeks knew about the magical properties of magnets. The magical properties of magnets. The ancient Greeks used a stone substance ancient Greeks used a stone substance called magnetite. They discovered that the called magnetite. They discovered that the stone always pointed in the same direction. stone always pointed in the same direction. Later, stones of magnetite called Later, stones of magnetite called lodestones were used in navigation. lodestones were used in navigation. William Gilbert, an English physician, first proposed in 1600 that the earth itself is a magnet, and he predicted that the Earth would be found to have magnetic poles. What is Magnetism? What is Magnetism? Magnetism is the force of attraction or repulsion of a magnetic material due to the arrangement of its atoms, particularly its electrons. All magnetic phenomena result from forces between electric charges in motion. The ends of a magnet are where the magnetic effect is the strongest. These are called poles. Each magnet has 2 poles 1 north, 1 south. Like repels like Like repels like Opposites attract! Opposites attract! Poles of a magnet always Come in pairs! If you cut a magnet in If you cut a magnet in half, half, you get 2 magnets! you get 2 magnets! S N S N S N No Monopoles Allowed It has not been shown to be possible to end up with a single North pole or a single South pole, which is a monopole ("mono" means one or single, thus one pole). Note: Some theorists believe that magnetic monopoles may have been made in the early Universe. So far, none have been detected. S N Magnetic Fields Magnetic Fields The region where the magnetic force The region where the magnetic force act is called the magnetic field act is called the magnetic field Defining Magnetic Field Direction Magnetic Field vectors as written as B Direction of magnetic field at any point is defined as the direction...
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Magnetism - More free powerpoints at...

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