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Magnetism

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A set of slides created to teach Magnetism to learners at Bishops Diocesan College in Cape Town.

A set of slides created to teach Magnetism to learners at Bishops Diocesan College in Cape Town.

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  • 1. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Magnets N S
  • 2. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Mmagnetism : Magnetic?  Which of the metals below are magnetic metals? Silver (Ag)
  • 3. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net What is a magnetic Field ? NS The iron filings locate the magnetic field and show the direction of the forces in this region. The region around a magnet where it has a magnetic effect is called its magnetic field. If you put a magnetic material in that field it will experience a force.
  • 4. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Magnetic Fields - Experiments Put the north poles of two bar magnets together. What happens? Now put the two magnets under a piece of paper with the N poles together. Carefully scatter iron filings on the paper. Draw what you see.
  • 5. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Magnetic field pattern with N and S poles together NNS S Notice the pattern of lines of force in this region. How are they different from before?
  • 6. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net S N Stroke a steel knitting needle with a magnet as indicated in the sketch. Do this at least 20 times – using the same motion. The needle will become magnetic and will keep its magnetism.
  • 7. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Electromagnetism : Magnetic Fields  What does the magnetic field around a current carrying coil [solenoid] look like? Using an iron nail as a solenoid investigate the properties of the magnetic field. Keeping the current the same, investigate how many paper clips the solenoid will support as the number of coils is varied. Then, keeping the number of coils of wire the same, investigate how many paper clips the solenoid will support as the current is varied. Record your results in the tables following:
  • 8. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Electromagnetism : Electromagnets Current [A] Number of paper clips attracted 0  Remember - keep the number of coils the same!
  • 9. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Electromagnetism : Electromagnets How the current affects the strength of an electromagnet -10 0 10 20 30 40 50 60 70 0 1 2 3 4 5 Current [A] Numberofclipsattracted
  • 10. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Electromagnetism : Electromagnets  We use large electromagnets in scrap yards to pick up scrap metal:  What metals would the electromagnet attract?  What advantages does an electromagnet have over a permanent magnet?
  • 11. SAMPLE ONLY SAMPLE ONLY SAMPLE ONLY For FULL presentation click HERE >> www.warnescience.net Electromagnetism : Electromagnets  Lifts, cars and other large electrical machines use high currents.  A relay can be used to allow a low current circuit to turn a large current circuit on.
  • 12. Hi - This is a SAMPLE presentation only. My FULL presentations, which contain loads more slides (with all the gaps filled in) as well as other resources, are freely available on my resource sharing website: www.warnescience.net (paste into your browser if link above does not work) Have a look and enjoy!