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Overview of Magnetic Fields and the Right-Hand Rule in PHYS 219 Recitation Week 5

In this Week 5 overview for PHYS 219, Kevin Ralphs discusses critical concepts in magnetism, including the Right-Hand Rule and the cross product. Understanding how to correctly apply equations related to magnetic fields is crucial to avoid misapplications. The recitation emphasizes the significance of closed-loop magnetic fields, how moving charges create these fields, and highlights the Lorentz Force's role in electromagnetic interactions. Students are encouraged to ask questions and clarify their understanding of these foundational concepts in magnetism.

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Overview of Magnetic Fields and the Right-Hand Rule in PHYS 219 Recitation Week 5

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Presentation Transcript

  1. PHYS 219 Recitation Kevin Ralphs Week 5

  2. Overview • HW Questions • Right-Hand Rule • Warning • Magnetic Fields

  3. HW Questions Ask Away…

  4. Right-Hand Rule and the Cross Product • Cross product is perpendicularto BOTH of the vectors in theproduct • You sweep your hand from thefirst vector to the second throughthe smallest angle between • Measures how perpendiculartwo vectors are

  5. Warning • There are multiple equations in this chapter that have • It is CRUCIAL that you understand which situations each equation is for so you don’t misapply them

  6. Magnetic Fields • Source • Moving Charges • This is true even for permanent magnets • Shape • Always form closed loops: this means there is no magnetic charge • Always curl around the direction charges are moving in a right-handed way for positive charges • Negative charges reverse the direction of the field

  7. Magnetic Fields • Lorentz Force • What does it tell me? • The force a charged particle experiences in an electromagnetic field • For a wire this becomes

  8. Magnetic Fields • The magnetic force is always perpendicular to the velocity of a charge • This gives some important results: • Magnetic fields do no work: magnetic forces do not change the speed of a particle, so the kinetic energy is constant ergo no work is done • Magnetic forces cause charges to move in loops or helices

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