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Dipole help

  1. Feb 23, 2008 #1
    1. The problem statement, all variables and given/known data
    A dipole sits a distance d above a point charge q which is located at the origin of our coordinate system. In (a) it is aligned in the z direction and in (b) in the y direction. Calculate the energy, force, and torque of the dipole in the field of the charge.
    (see attachment)

    2. Relevant equations
    U=-[tex]\vec{P}\bullet\vec{E}[/tex] Energy
    [tex]\tau=\vec{P}\times\vec{E}[/tex] Torque

    3. The attempt at a solution
    For (b) it is clear that the Torque is 0, but that is about all i've figured out so far...
     

    Attached Files:

  2. jcsd
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