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Field Around Magnet

Use compass to map field of magnets, investigate field strength variation with distance, understand field direction in relation to magnet poles. Conduct activities with iron filings, bar magnet, and horseshoe magnet to visualize field lines and learn about magnetic properties. Discover ferromagnetism, magnetic monopoles, forces on moving charges, and Earth's magnetic field dynamics. Engage in activities, discussions, and problem-solving to enhance understanding of magnetism.

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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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