Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

B Magnetic Field from Protons vs Electrons

  1. Sep 12, 2018 #1
    If an electron is moving in a circle in a magnetic field, it produces a magnetic field in accordance to the right hand rule. If a proton is moving in a circle in a magnetic field, would it produce a magnetic field in accordance to the left hand equivalent to the right hand rule.
     
  2. jcsd
  3. Sep 12, 2018 #2
    You are correct as magnetic fields are created by moving charges, and the example would satisfy the criteria. Although, I assume it would be tiny compared to the surrounding magnetic field. The right hand rule would work for a proton.
     
  4. Sep 12, 2018 #3

    Charles Link

    User Avatar
    Homework Helper
    Gold Member

    The magnetic field for both is described by Biot-Savart's law. ## \vec{B}=\frac{\mu_o}{4 \pi} \frac{q \vec{v} \times\vec{r}}{|\vec{r}|^3} ##. With a negative charge on the electron, its magnetic field is opposite the direction given by ## \vec{v} \times \vec{r} ##.
     
  5. Sep 12, 2018 #4
    So the positive charge of a proton would mean the magnetic field is just ##\vec{v} \times \vec{r}##?
     
  6. Sep 12, 2018 #5

    Charles Link

    User Avatar
    Homework Helper
    Gold Member

    See the part I added to post 3=the formula for ## \vec{B} ##.
     
  7. Sep 12, 2018 #6
    Ok. Thank you.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted