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Journal 4/3/14

Journal 4/3/14. What would you do if you had a super-powerful magnet? (Make it as powerful as you want). Objective Tonight’s Homework. To learn about magnetic fields. pp 496: 1, 2, 3, 4. Notes on Magnetic Fields.

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Journal 4/3/14

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  1. Journal 4/3/14 What would you do if you had a super-powerful magnet? (Make it as powerful as you want) Objective Tonight’s Homework To learn about magnetic fields pp 496: 1, 2, 3, 4

  2. Notes on Magnetic Fields We’ve seen that electric charge creates electric fields. Magnets similarly create magnetic fields.

  3. Notes on Magnetic Fields We’ve seen that electric charge creates electric fields. Magnets similarly create magnetic fields. Field lines travel from North to South in the most efficient path possible.

  4. Notes on Magnetic Fields We can draw up, down, left, or right fields. But what about towards or away? We draw it like this: • Towards or Away or out of the page into the page X

  5. Notes on Magnetic Fields We can draw up, down, left, or right fields. But what about towards or away? We draw it like this: • Towards or Away or out of the page into the page These symbols come from arrows. Toward is like the tip coming toward you. Away is like the feathers in the back. X

  6. Notes on Magnetic Fields The unit for measuring the strength of a magnetic field is the Tesla How strong is this?

  7. Notes on Magnetic Fields The unit for measuring the strength of a magnetic field is the Tesla How strong is this? Small bar magnet – 0.01 T Neodymium magnet – 0.2 T Speaker electromagnet – 1 T Strong lab magnet – 10 T

  8. Notes on Magnetic Fields Earth itself has a magnetic field.

  9. Notes on Magnetic Fields Earth itself has a magnetic field. This field is weak, measuring only 0.00005 T. However, this is strong enough for things like compasses to work and protects us from particles streaming out from the sun.

  10. Notes on Magnetic Fields When we studied electrical force and electric fields, we found an equation for how strongly 2 charges will want to pull together. Luckily for you all, it’s MUCH harder to generate similar equations for magnetic fields and magnetic force. For now, we’ll keep our ideas purely conceptual.

  11. Catch Up Time You have time the rest of class to finish your vocab activity, to do test corrections, or work on any other stuff you need for this class.

  12. Exit Question #36 Which direction is the magnetic field at right moving when seen from the ceiling looking down? a) Straight left b) Straight right c) Straight up d) Straight down e) In a clockwise circle f) In a counterclockwise circle                                                                                

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