1 / 13

Magnetism

Magnetism. Magnetic materials. All magnets have a North pole and a South pole. Just like electric charges, like poles repel and opposite poles attract. Remember playing with magnets as a kid?. Even breaking a magnet into smaller pieces doesn’t remove the two poles.

paulina
Download Presentation

Magnetism

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Magnetism

  2. Magnetic materials • All magnets have a North pole and a South pole. • Just like electric charges, like poles repel and opposite poles attract.

  3. Remember playing with magnets as a kid?

  4. Even breaking a magnet into smaller pieces doesn’t remove the two poles.

  5. Magnets produce magnetic fields

  6. How to draw magnetic field lines • Magnetic field lines are always drawn outward from the North pole and inward to the South pole. • The North end of a compass will point toward the South pole of a magnet.

  7. So how do paper clips stick to a magnet?

  8. The Earth even has a magnetic field! • In response to the Earth's magnetic field, the compass will point toward the geographic North Pole of the Earth because it is in fact a magnetic south pole. The magnetic field lines of the Earth enter the Earth near the geographic North Pole.

  9. Applications of Magnetism • Compasses • CD and DVD files • Audio and video cassette recording • MRI scans • Aurora borealis • Homing pigeons (what?!) • Electric generators • Transformers

  10. Some of those applications are related to electricity – why are they here? • Hans Christian Oersted discovered that an electric current produces a magnetic field. • 1st right hand rule • Michael Faraday proved the reverse to be true; that a magnetic field produces an electric current • 3rd right hand rule

  11. 1st right hand rulemagnetic field around a current-carrying wire

  12. 2nd right hand ruledirection of field around an electromagnet

  13. 3rd right hand ruledirection of force on a wire in a magnetic field

More Related