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## PowerPoint Slideshow about ' PHYS 219 Recitation' - tyra

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Presentation Transcript

Overview

- HW Questions
- Right-Hand Rule
- Warning
- Magnetic Fields

HW Questions

Ask Away…

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

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

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

Magnetic Fields

- Lorentz Force
- What does it tell me?
- The force a charged particle experiences in an electromagnetic field
- For a wire this becomes

- What does it tell me?

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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