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How do change in magnetic flux induces emf in a coil ?

  1. Jun 24, 2011 #1
    According to Faraday's laws... change in magnetic flux linking a coil induces current in the coil.., but for conduction of electrons ...there must be an electric field !! how is the electric field induced in the coil??
  2. jcsd
  3. Jun 24, 2011 #2


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    welcome to pf!

    hi hanii! welcome to pf! :wink:
    not true …

    for example, an electron moving in and perpendicular to a purely magnetic field will move in a circle at constant speed …

    (and if it moved through an electric field, it would do work and either lose or gain energy, but here it doesn't)
    Last edited by a moderator: Apr 26, 2017
  4. Jun 24, 2011 #3
    The curl of the electric field is equal to the negative of the change in the magnetic field with respect to time. Take a look at Maxwell's equations. So, when there is a changing magnetic field (which we have in this case), an electric field is induced which drives the electrons around the coil.
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