emf

  1. T

    back emf ,induced emf difference..

    i read some where that induced emf and back emf are the same but apperantly it not i have solves the 3rd question but the 5th says its the opposite on the induced emf http://i26.tinypic.com/2o61f.jpg so what is the difference between them. induced emf comes as a result of a change in flux so...
  2. R

    emf and current of square coil.

    A magnetic field is perpendicular to the plane of a single-turn circular coil. The magnitude of the field is changing, so that an emf of 0.91 V and a current of 3.2 A are induced in the coil. The wire is the re-formed into a single-turn square coil, which is used in the same magnetic field...