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Moving charged particle and its magnetic field

  1. Oct 15, 2015 #1
    What kind of magnetic field does a moving, electrically charged foam ball create? What are the relevant variable determining the properties of the magnetic field? Its charge? velocity? (Assume it's in space and charge is in the shape of a point)

    Are electrons or ions analogous to this foam ball?
  2. jcsd
  3. Oct 16, 2015 #2
    Any moving point charge creates a magnetic field, whether it is an electron, ion, or foam ball. The formula (called the Biot-Savart law) is given by:
    B of a charge formula.jpg The constant in front is the permeability of free space divided by 4 pi, and is equal to 10^(-7) T.m/A. q is the charge in coulombs, the vector v is the velocity of the charge, vector r is the position vector from the charge to the point in space where you want to find the magnetic field, and r in the denominator is just the magnitude of the vector r. You will find this in any textbook on basic physics
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