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Movement of Coil and Magnet

  1. Mar 22, 2009 #1

    What is the answer? Should be B

    Please Explain the reason behind

    I don't understand how an induced Magnetic Field will cause the coil to move.

    (Not Homework)


    thanks for helping
  2. jcsd
  3. Mar 22, 2009 #2
    Is an electrically induced magnetic field somehow different from a magnetic field produced by a permanent magnet?

    When a magnet moves through the coil of wire, a current is induced in the wire. When current is flowing through a wire, a magnetic field is generated around the wire. If another magnetic field is present, they will interact.

    Induction Motor
  4. Mar 22, 2009 #3
    B is true if the coil of wire is shorted. The dB/dt linking the coil will develop a voltage around and hence a current in the wire that opposes the field of the magnet.
    Last edited: Mar 22, 2009
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