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AP Physics III.D

AP Physics III.D. Magnetic Fields. III.D1 − Magnetic Fields. The prized lodestone. Force of one magnet on another. Magnetic field as plainly demonstrated by iron filings and compasses. The direction of a magnetic field. The Force of a Magnetic Field on a Moving Charge.

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AP Physics III.D

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  1. AP Physics III.D Magnetic Fields

  2. III.D1 − Magnetic Fields

  3. The prized lodestone

  4. Force of one magnet on another

  5. Magnetic field as plainly demonstrated by iron filings and compasses.

  6. The direction of a magnetic field

  7. The Force of a Magnetic Field on a Moving Charge

  8. A magnetic field exerts a force on a charged particle when . . . • The charge is moving • The velocity of the moving charge has a component that is perpendicular to the direction of the field

  9. Consider . . . 1) a magnetic field and the charge moving parallel or antiparallel to the field

  10. 2) The charge moving at 90º to the direction of the field (time for Right Hand Rule Number 1)

  11. 3) The charge moving between 0º and 180º to the direction of the field

  12. Note: for positive charges in a magnetic field use your right hand. For negative charges in a magnetic field use your left hand.

  13. Motion of a Charged Particle in a Magnetic Field

  14. Work done on a charged particle moving through a electric and magnetic fields

  15. A for a handy formula which I never remember and is not a “boxer” but one you can easily derive.

  16. Ex. A particle with charge +q traveling with velocity v, enters a uniform magnetic field B, as shown below. Describe the particle’s motion. B v +q

  17. III.D.2 Force on a current carrying wire in a magnetic field

  18. RHR-1 Again

  19. Ex. A U-shaped wire of mass m is lowered into a magnetic field B that points in the plane of the page. What is the magnitude and direction of the current I that must pass through the wire if the net force on the wire is zero?

  20. III.D.3 Magnetic fields produced by current-carrying wires

  21. Electromagnetism – the linking of the motion of electric charges with the creation of a magnetic field

  22. Extraordinary Demo!

  23. Right-Hand-Rule Number 2

  24. v0 +e I

  25. Forces on parallel current carrying wires

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