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Homework Help: Field problem

  1. Oct 30, 2008 #1
    If a particle moves in the +x direction with velocity [tex] v [/tex] in a box that has either a magnetic field or an electric field, and later it is moving in the +y direction with velocity [tex] v + 5 [/tex], what field is in the box?

    So it would be an electric field because magnetic fields can't change speed?
  2. jcsd
  3. Oct 30, 2008 #2
    Re: Field

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