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Download Lesson 7 Magnets
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Play with your magnets! ALL magnets have two poles NORTH seeking pole SOUTH seeking pole Breaking a magnet produces two magnets! N N S N S S N S Opposites attract! Opposite poles attract and like poles repel Magnetic materials Magnetic materials Iron (steel), Cobalt and Nickel Magnetic induction Magnetic induction When a magnetic material is close to a magnet, it becomes a magnet itself magnet S N S We say it has induced magnetism N Hard and Soft Magnetism Soft Magnetism Pure iron is a soft magnetic material before S N S after N S NN Not a magnet Iron nail It is easy to magnetise but loses its magnetism easily Hard Magnetism Steel is a hard magnetic material before S after N S S N NN S N It’s a magnet! Steel paper clip It is harder to magnetise, but keeps its magnetism (it is used to make magnets!) Magnetic field I wonder if this is a magnetic field? Magnetic field Magnets (and electric currents) produce magnetic fields around them. In the magnetic field, another magnet or magnetic material will experience a magnetic force. Magnetic field lines We can represent the magnetic field around a magnet using field lines. Magnetic field lines The arrows show the direction a compass needle would point at that point in the field. Magnetic field lines The arrows show the direction a compass needle would point at that point in the field. The closer the field lines are, the stronger the magnetic force felt Earth’s Magnetic Field Remember the North of a compass needle points to the geographic north pole (i.e. the geographic North pole is a magnetic south pole!) Field around a bar magnet Two bar magnets Strong uniform field Two bar magnets no field! That’s it! Mind-map Mr Porter is now going to put these slides on a loop and you’re going to mind-map them!