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Electric field of a magnetic monopole

  1. Oct 24, 2013 #1
    A north magnetic monopole moving with uniform velocity through a uniform electric field would experience a force (assume the direction of the force to be upward along the x-axis) due to the circular electric field created around it. Similarly a south magnetic monopole would experience a force (opposite to that experienced by the N monopole) when moving through a electric field.

    If we were to combine the N and S monopoles to form a dipole, the magnetic dipole would also experience a force similar to the force experienced by the monopoles.

    My question is how is it that for the magnetic dipole the 2 opposing electric fields (caused by the N and S monopole) do not cancel each other such that no force is experienced by the magnetic dipole, which would be similar to the behaviour of an electric dipole which does not experience any force while moving through a magnetic field.
    Last edited: Oct 24, 2013
  2. jcsd
  3. Oct 25, 2013 #2
    Any answers / suggestions would be most welcome....
  4. Oct 25, 2013 #3
    If you allow for magnetic monopoles, the electric and magnetic forces are completely analogous. A dipole wouldn't feel a net force but it would feel some torque.
  5. Oct 28, 2013 #4
    Thanks Khashishi of your reply and sorry I didn't respon earlier. In actuality a dipole magnet does feel a net force, implying that electric and magneic forces are not completely analogous
  6. Oct 28, 2013 #5


    Staff: Mentor

    No, it doesn't. A dipole magnet does not feel a net force when moving through a uniform electric field.
  7. Oct 29, 2013 #6
    Why is there no net force experienced by the dipole magnet?

    I was under the impression that a dipole magnet moving with uniform velocity (assume it to be a bar magnet and the direction of motion being along its polar axis) would have a uniform electric field (the direction of the field would also be uniform) along its length surrounding it, and would thus feel a net force when moving through an electric field.
  8. Oct 29, 2013 #7
    Because in a dipole, the forces on the north and south end cancel out.
  9. Oct 29, 2013 #8


    Staff: Mentor

    The electric field produced by a moving magnetic dipole would be non-uniform. As Khashishi said, the total force would cancel out.
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