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Understanding Magnetic Fields and Electromagnetic Induction: Lesson Summary

In today's lesson, we explored the concepts of magnetic field plotting and electromagnetic induction. Students gathered around to learn about magnetic field lines, which indicate the direction a compass needle would point in the field. We conducted a hands-on activity, winding wire around a cardboard tube to create a coil and using a multimeter to observe induced current when moving a magnet through the coil. This homework task is due next Friday, 16th September. Please refer to the simulation link provided for further exploration: http://phet.colorado.edu/sims/faraday/generator_en.jnlp.

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Understanding Magnetic Fields and Electromagnetic Induction: Lesson Summary

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  1. Do now! Can you continue withthe ‘Draw the sentences’ from last lesson? This is to be FINISHED FOR HOMEWORK. Due next Friday 16th September.

  2. Today’s lesson • Plotting magnetic fields • Electromagnetic induction

  3. Plotting magnetic fields

  4. Can you gather around Mr Porter? Quietly and sensibly

  5. Plotting magnetic fields

  6. 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

  7. Field around a bar magnet

  8. Electromagnetic induction • Can you carefully wind your wire around the cardboard tube?

  9. Electromagnetic induction • Put your coil in this circuit. The multimeter should be on the μA scale. μA

  10. Electromagnetic induction • MOVE a magnet in and out of the coil. Watch the meter! μA

  11. Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced)

  12. Electromagnetic induction If a magnet is moved inside a coil an electric current is induced (produced) COPY this please!

  13. Electromagnetic induction A electric current is induced because the magnetic field around the coil is changing(the coil ‘cuts through’ the lines of field). COPY this please!

  14. Gather round

  15. http://phet.colorado.edu/sims/faraday/generator_en.jnlp

  16. Can you stick this in please? Generator/dynamo A generator works by rotating a coil in a magnetic field (or rotating a magnet in a coil). A slip-ring commutator produces alternating current (a.c.)

  17. COPY this please!

  18. Let’s try some questions! Pages 215 and 219.

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