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Homework Help: Magnetic moment of an orbitting charge

  1. Aug 19, 2008 #1
    1. The problem statement, all variables and given/known data
    "A partical of charge q is rotating in a circular orbit of radius r[/i with angular velocity w. Determine the magnetic moment associated with the motion of the charge.


    2. Relevant equations
    [tex]Q=IT[/tex]?
    [tex]\vec{\mu}=I\vec{A}[/tex]

    3. The attempt at a solution

    I know how to do it, i jsut can't remember how to get work out the current of an orbitting charge. It's driving me insane, I know i know how to do it, i just can't remember! Please help!
     
  2. jcsd
  3. Aug 19, 2008 #2
    Remember (current) = (charge passed through)/(time elapsed).

    In this case, a charge q passes through a certain point every 2pi/w.
     
  4. Aug 19, 2008 #3
    yeah, that's what i was thinking. it just seemed too easy!

    so

    [tex]\vec{\mu} = \frac{q \omega r^{2}}{2}[/tex]
     
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