Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Magnetic field induced by current in a conductor question

  1. May 16, 2010 #1
    I am trying to understand Lenz law as it applies to an A.C. generator, Lenz law says " an induced current is always in such a direction as to oppose the motion or change causing it". Does this mean that if the north pole of a magnet passes a conductor in a stator, that the current induced in the the conductor will cause that section of the stator perpendicular to the north pole of the magnet to become a south pole magnet? and is this magnetic attraction what causes drag?
  2. jcsd
  3. May 17, 2010 #2
    When the magnet is approaching the induced current will produce a repulsive field, and when it is moving away then the field will be attractive. So approaching will produce the same kind of pole and moving away the opposite pole.
  4. May 19, 2010 #3
    Consequent electromagnetic torque is proportional with sin(ø),which ø is space difference angle between rotating field of stator and rotating field of rotor, therefore induced field pole cannot be same (ø=0) or opposite (ø=180˚) pole of field that originate induced currents.

    Creative thinking is enjoyable, Then think about your surrounding things and other thought products. http://electrical-riddles.com
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook