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# PHYS 219 Recitation - PowerPoint PPT Presentation

PHYS 219 Recitation. Kevin Ralphs Week 5. Overview. HW Questions Right-Hand Rule Warning Magnetic Fields. HW Questions. Ask Away…. Right-Hand Rule and the Cross Product. Cross product is perpendicular to BOTH of the vectors in the product

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PHYS 219 Recitation

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#### Presentation Transcript

Kevin Ralphs

Week 5

• HW Questions

• Right-Hand Rule

• Warning

• Magnetic Fields

• 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

• 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

• 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

• Lorentz Force

• What does it tell me?

• The force a charged particle experiences in an electromagnetic field

• For a wire this becomes

• 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