Phys 219 recitation
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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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Phys 219 recitation

PHYS 219 Recitation

Kevin Ralphs

Week 5


Overview

Overview

  • HW Questions

  • Right-Hand Rule

  • Warning

  • Magnetic Fields


Hw questions

HW Questions

Ask Away…


Right hand rule and the cross product

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

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

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 fields1

Magnetic Fields

  • Lorentz Force

    • What does it tell me?

      • The force a charged particle experiences in an electromagnetic field

      • For a wire this becomes


Magnetic fields2

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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