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Magnetic field's propagation

  1. Nov 18, 2009 #1
    well I'm so confused with this,
    the maximum speed of magnetic and electric fields is c ...

    however when one tries to reduce an electic current generating a magnetic field into one charge Q moving with speed v from one point to another in a distance x, then the magnetic field intensity will be Qv/(r^2 sin(theta)) , where r is the distance between the point of calculation and the charge.

    considering the charge moving near the speed of light, the magnetic flux would take a time t to reach that point, but in this time t the charge would have changed it's position, so the field will fade before reaching the point..

    so, no observer will measure any magnetic field from the charge ?

    and if this charge was an electron beam instead, a magnetic flux will come out of every charge an fade out in nearly no time, independently from the other charges ... or what exactly happens ?
  2. jcsd
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