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Magnetism and Magnetic Materials DTU (10313) – 10 ECTS KU – 7.5 ECTS

Magnetism and Magnetic Materials DTU (10313) – 10 ECTS KU – 7.5 ECTS. Module 8 25/02/2011 Permanent magnets. Macro – m m-mm. Intended Learning Outcomes (ILO). (for today’s module). Explain how a small piece of graphite can levitate Build a magnetic levitation device

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Magnetism and Magnetic Materials DTU (10313) – 10 ECTS KU – 7.5 ECTS

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  1. Magnetism and Magnetic Materials DTU (10313) – 10 ECTS KU – 7.5 ECTS Module 8 25/02/2011 Permanent magnets Macro – mm-mm

  2. Intended Learning Outcomes (ILO) (for today’s module) Explain how a small piece of graphite can levitate Build a magnetic levitation device Construct a dipolar magnet and maximize its strength Quantify the lifting force of a magnet Describe the magnetic-to-kinetic energy transfer in a simple magnetic gun

  3. Magnetic levitation • Think about how to use a set of magnets to levitate an object • Build a magnetic levitation device together with your group • Explain to the class the working principles of your levitation device Dipolar magnets • Play around with magnetic hard spheres, assemble them into various shapes and orderings (ferromagnetic and anti-ferromagnetic arrangements) • Measure fields with the hall probe device • Construct the most powerful magnet you can think of by using your set of spheres • Compete with the other groups and develop the largest lifting force (to be measured with a digital balance) A simple magnetic gun • Look at the demonstration, try it out for yourself, and figure out how it works

  4. Wrapping up • Dipolar ferromagnets and anti-ferromagnets • Chains, necklaces, vortices, shapes… • Diamagnetic and ferromagnetic levitation • The simplest magnetic gun: magnetic-to-kinetic energy transfer Next lecture: Tuesday March 1, 13:15, KU (A9) Order and broken symmetry (KL)

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