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Understanding Magnetic Fields: From Permanent Magnets to Current-Creating Solutions

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This chapter discusses the sources of magnetic fields, detailing how permanent magnets and electric currents generate these fields. It covers fundamental concepts such as the right-hand rule, Biot-Savart Law, and the magnetic field due to an infinite straight wire. Additionally, it explores the magnetic effects of coils and solenoids, demonstrating their similarities to bar magnets. The chapter provides examples of calculating magnetic fields and analyzing forces between parallel currents, as well as practical applications of these principles in real-world scenarios.

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Understanding Magnetic Fields: From Permanent Magnets to Current-Creating Solutions

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  1. CHAPTER 28 Sources of Magnetic Field

  2. Producing a magnetic field Permanent Magnet Current

  3. Magnetic field due to currents Right hand rule

  4. View from the top

  5. VIEW FROM THE SIDE

  6. Biot-SavartLaw What if the wire isn’t straight?

  7. Infinite Straight wire P I

  8. Infinite Straight wire (Cont.) Strategy: write everything in terms of θ P

  9. Example: Addition of B Fields Find the B field at point P

  10. Example: Addition of B Fields

  11. Force between parallel currents What if the currents are in opposite directions?

  12. Field and Force

  13. MAGNETIC FIELD OF A LOOP OF CURRENT

  14. COIL AND BAR MAGNET The magnetic field produced by a coil is almost identical to that of a bar magnet.

  15. Solenoids

  16. Solenoids n: Number of turns per unit length Unit of n: m-1=turns/m

  17. Ampere’s Law

  18. Right hand rule, again

  19. Long Straight Wire, again

  20. Derivation: B Field inside a Solenoid

  21. APPLICATIONS

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