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Induced magnetic and electric fields question

  1. Apr 30, 2009 #1
    1. The problem statement, all variables and given/known data
    1. Oersted discovered that a curernt carrying wire caused a magnet to move. Why does the magnet move?

    2. Ampere discovered that a magnet caused a current carrying wire to move. Why does the wire move?

    2. Relevant equations

    (i) ∫Edl = - dΦ_B/dt
    (ii) ∫Bdl = Iμ_0 + μ_0ε_0(dΦ_E/dt)
    (iii) F = qvxB
    (iv) F = IBxL

    3. The attempt at a solution
    1. By eq. (i), a changing electric field will result in a change in magnetic flux i.e. will induce a magnetic field. This magnetic field will react with the magnetic field of the magnet, causing it to move.

    2. By eq. (ii), a changing magnetic field will result in a change in electric flux i.e. will induce an electric field. This will react with the electric field of the current-carrying wire, causing it to move.

    Do you think these answers are sufficient? Is there anything more to be said?
  2. jcsd
  3. Apr 30, 2009 #2
    Hi Pyroadept

    Its probably worth mentioning the associated force in each situation, and how the force is created. After all its the force that causes the wire and magnets to move in the first place.
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