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Field Around Magnet

Field Around Magnet. Use a compass to map the direction of the magnetic field surrounding a magnet. White board your results. In particular: how does the strength of the field vary with distance from the wire? how does the field direction relate to the poles of the magnet?.

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Field Around Magnet

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  1. Field Around Magnet • Use a compass to map the direction of the magnetic field surrounding a magnet. • White board your results. In particular: • how does the strength of the field vary with distance from the wire? • how does the field direction relate to the poles of the magnet? Magnetism

  2. Activity: Map Field of Magnets • Use iron filings to map the field of a • bar magnet • horseshoe magnet • White board results • draw field lines. • how might magnets generate magnetic fields? Magnetism

  3. Magnetic Field Lines • direction of magnetic field, B, is parallel to field line • number of lines per area is proportional to strength of field • field lines point • from N to S • field lines formclosed loops Magnetism

  4. Magnetism No magnetic monopoles! Magnetism

  5. Magnets are similar to Electric Dipoles Magnetism

  6. Ferromagnetism • Ferromagnetic material • iron or other materials that can be made into magnets • You can make a magnet from iron by placing it in a strong B field • individual domains become aligned with external B field • Loss of magnetism from: • dropping • heating • Curie temperature • 1043 K for iron Preferentially downwards Random Magnetism

  7. Cross Product – Right Hand Rule Magnetism

  8. Specifying 3 Dimensions • out of page • tip of arrow • into page • tail of arrow Magnetism

  9. Force on a moving charge • Right Hand Rule (#2) • qv = fingers • B = bend fingers • F = thumb • Find the direction of the force on a negative charge for each diagram shown. Magnetism

  10. Magnetism

  11. Think-Pair-Share • Derive an expression for the radius of an e-’s orbit in a uniform B field. Express your answer in terms of me, v, qe, and B. Turn in your solution! Magnetism

  12. Earth’s Magnetic Field • magnetic declination • angular difference between geographic north and magnetic north • varies with latitude Magnetism

  13. Practice Problems • Magnetism: Worksheets 1 & 2 • Finish before next class Magnetism

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