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Magnetism and Magnetic Levitation Trains

Magnetism and Magnetic Levitation Trains. Does the US have them ? How do they work ? What do they have to offer ?. 1. Japan and Germany have demo versions. V max = 350 mph. 2. There is some talk of maglev trains in Southern Calif, Baltimore-DC, and in Virginia.

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Magnetism and Magnetic Levitation Trains

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  1. Magnetism and Magnetic Levitation Trains Does the US have them ? How do they work ? What do they have to offer ? 1. Japan and Germany have demo versions. Vmax = 350 mph. 2. There is some talk of maglev trains in Southern Calif, Baltimore-DC, and in Virginia

  2. What does a magnet do ? It can deflect a compass needle. N S • This can’t be explained by mechanical forces. Can electrostatic forces • explain this ? • No, these forces are in the wrong direction and occur even if • the compass needle, magnet are Neutral !!! • So…we must postulate a new type of force, with new type of ‘charges’ • (which we call poles). Let’s call this force ‘Magnetism’.

  3. N S What’s in a Magnet ? What if you cut it up ? You get many magnets with N, S poles ! Experimentally, no single magnetic poles have been seen! Just dipoles.

  4. N S What is the source of magnetism ? What makes a magnet ? Current flowing through wires. This can pick up paper clips !? How ? It’s ‘magnetic’. current loop with current i A bar magnet

  5. current loop with current i A bar magnet N S What’s the difference between a current loop and a bar magnet ? They can produce the same magnetic field ! Magnetism is intimately related to flowing currents.

  6. 3 Methods of Magnetic Levitation • Magnets on Track and Train – Repulsion produces levitation • but equilibrium is UNSTABLE. • AC Levitation – AC Electromagnet on Train, on Metal Tracks • produces levitation but energy immediately • decays away. • Dynamic Levitation – Magnet on Train, on Metal Tracks • produces least energy dissipation by allowing • the train to initially move fast enough. See Class Discussion Notes on Electromagnetic Induction and Lenz’s Law

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